Crossword Genius

Laughing uncontrollably following theatre visit? (2,8)

Ross

I believe the answer is:

in stitches

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

I don't understand the rest of the clue.

(Other definitions for in stitches that I've seen before include "extremely amused" , "much affected by comedy?" , "Helpless with laughter" , "as one may be on leaving the theatre?" , "you may be laughing" .)

I've seen this clue in The Times.
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