Crossword Genius

Details — of those using door? (3,3,4)

Ross

I believe the answer is:

ins and outs

'details' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for ins and outs that I've seen before include "Details" , "cabinet reshuffle?" , "signs on doors perhaps" , "parliamentary election result?" .)

I've seen this clue in The Times.
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