Take a gander at cocktail in East End bar (7)

I believe the answer is:

eyeball

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'take a gander' is the definition.

I can't explain the rest of the clue.

(Other definitions for eyeball that I've seen before include "Label ye (anag)" , "Socket filler" , "Stare at closely (colloq.)" , "not exact" , "Confront (_____ to _____)" .)

I've seen this clue in The Everyman puzzle in The Observer.

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