The actor still manages to create magic moments on the screen as he portrays...

Please help me understand the red parts in the following text:

BASED on Utpal Dutt's classic play, Aajker Shahjahan, The Last Lear is a sad example of how adaptation can sometimes scuttle (=destroy) a good script and transform a landmark (=important, popular) theatrical experience into flawed (=not perfect, or containing mistakes) cinema. The film only works for Amitabh Bachchan aficionados (=an enthusiastic admirer or follower; a devotee or a fan) who can savour (=to give flavor to, season) the desi (=local) bard (=poet) bellowing out (= to shout in a deep voice) the best of Shakespeare in his characteristic baritone (=In music, a baritone is a man with a fairly deep singing voice that is lower than that of a tenor but higher than that of a bass).

The actor still manages to create magic moments on the screen as he portrays (=plays) the arrogance and the naked (=obvious) need of a has-been (=someone who was important or popular but who has now been forgotten) actor who believes he is always good, simply because he can never be bad. Yet, he clings (=to stick onto or hold something or someone) desperately (=feeling that you have no hope and are ready to do anything to change the bad situation you are in) to his last chance to display histrionics (=theatrical performance) and is even ready to grovel (=to abase oneself) before the filmmaker for his famous last shot.

The film traces (=follows the progress) the resurrection (=when something that had disappeared or ended is brought back into use or existence) of Harry (Amitabh), a retired actor who lives in a dimly-lit (=in a dim manner) house with memories of a glorious past, until he is pulled out of anonymity by Sid (Arjun Rampal), the avant garde (=avant-garde music, literature etc is extremely modern and often seems strange or slightly shocking) filmmaker who wants to make a realistic film.

After some drunken (=a situation in which alcohol is consumed) camaraderie (=a feeling of friendship that a group of people have, especially when they work together), Harry consents (=agrees) to play the clown in the movie and forges (=builds) a friendship with both the director and the lead actress, Preity Zinta. But, when the curtains go up, and the accolades (=tributes) begin to pour in (=come in) after the premier (=first presentation of literary work), Harry is back behind the tightly shut blinds of his house and the show simply goes on: ruthlessly, selfishly, unkindly.

It's a poignant (=cutting, something which makes you sad) story that loses most of its bite because of the rambling (=rambling speech or writing is very long and does not seem to have any clear organization or purpose) screenplay and the unnecessary subplot (=a plot (=set of events) that is connected with but less important than the main plot in a story, play etc) about emotionally battered (=hit or emotionally hurt) women and feminist wailing (=to say something in a loud, sad, and complaining way).

Preity Zinta, Shefali Shah and Divya Dutta form a chest-beating (=to show great sadness or guilt in an obvious or public way) sisterhood that consumes most of the screen time with their pointless tales of emotional abuse.

Also, the story is told by a narrator who gives a whiny (=high-pitched) voice-over (=information or remarks that are spoken on a television programme or film by someone who is not seen on the screen) that rids (=overcomes) the film of all its subtlety (=a thought, idea, or detail that is important but difficult to notice or understand). Add to this, the unconvincing climax, and you have a film that becomes watchable, here and there (=scattered around or happening in several different places): when Arjun Rampal and Amitabh Bachchan indulge in creative banter (=teasing, joking).