Allow to enter (3,2)

I think it could be either:

Which length description are you looking for?:

3,2

let in

'allow to enter' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for let in that I've seen before include "swindle . . ." , "Allowed to enter" , "Allow to enter" , "Grant entry" , "Admit" .)

I've seen this clue in The Washington Post, the Evening Standard and the Newsday.

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