Can you tell me what "cache" means?

The text below is from the subtitle of a documentary, The Century of The Self.

In the text, I cannot figure out what cache means?

Can you tell me what it means?

[In the dictionary, it means "a group of things that have been hidden in a secret place." But I cannot relate it to the context.]

He was Freud's "agent" if you will, to get his books published. Well of course once the books were being published Eddie couldn't help himself but to promote these books; see (to it) that everybody read them, make them controversial; emphasize the fact that 'do you know what Freud says about sex and what he thinks cigarettes are a symbol of' and so on and so forth. How do you suppose all those stories got out? Certainly the academics weren't spreading these around the country Eddie Bernays was. Then when Freud became accepted, well then of course to go to a client and go 'well Uncle Siggy' see then that had some cache. But notice there, first Eddie created Uncle Siggy in the US, made him acceptable secondly, and thirdly then capitalized on Uncle Siggy. [In the text, Uncle 'Siggy' is Freud who was Eddie's uncle.]