A tethered goat is tied to something (such as a fence or post) so that it stays in a very restricted area and is not able to roam freely. Thus, the ghostwriter is apparently limited in his ability to write about politicians.
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'Tethered goat' would have a similar meaning to 'sacrificial lamb' or 'lamb led to the slaughter'. Think of the movie Jurassic Park--in one scene they show a goat chained to a stake and put into the T-Rex pen for its lunch. A gruesome mental picture, I know, but it's suggestive of the meaning of the phrase. I believe a tethered goat was also a technique used to draw wild game into open land so
A "tethered goat" is a reference to the practice of tying a goat to a stake as bait when hunting predatory game animals. The predator comes to eat the goat and is shot by the hunter. You can see this practice in the film The Ghost and the Darkness.
I've read the others responses over the years and the bait answer doesn't seem right. There is a tethered goat problem in math that has a goat tied to a post and the goat can eat all the grass he wants within limits of the tether; but as the movie character implies he can't have the depth to uncover the ground out of his reach that the previous ghost writer "McAra" found or so it would seem. S
A tethered goat in the Royal Air Force is an aircraft flying as a target for a fighter aircraft to intercept and/or dogfight against. The target is supposed to make it hard but not impossible for the fighter to be successful. The target aircraft is flown by an experienced pilot or instructor who can judge just how hard to manoeuvre but still get beaten. The term has been in use at least as far