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Cracking up, post-op? (2,8)

Ross

I believe the answer is:

in stitches

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'cracking up' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for in stitches that I've seen before include "Helpless with laughter" , "Laughing a lot" , "Following a visit to the theatre one may be" , "Laughing uncontrollably" , "After an operation" .)

I've seen this clue in the Sydney Morning Herald.
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