It lets you in and gets you something to eat (6)

I believe the answer is:

entree

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'something to eat' is the definition.
(entree is a kind of food)

I can't explain the remainder of the clue.

(Other definitions for entree that I've seen before include "The right ot privilege of admission" , "The right to go in to the dish" , "Dinner course" , "Privilege of admission, or food dish" , "Main course of a meal" .)

I've seen this clue in the Evening Standard.

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