Go back in (2-5)

I think it could be either:

Which length description are you looking for?:

2-5

re-enter

'go back in' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for re-enter that I've seen before include "compete again" , "Come or go in again" , "Come back inside" , "Go back in" .)

I've seen this clue in The Independent and The Telegraph.

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