Wow! Not even posh journalist suffered an attack of the giggles (7)

I believe the answer is:

corpsed

'suffered an attack of the giggles' is the definition.

'wow not even posh journalist' is the wordplay.
'wow' becomes 'cor'.
'not even' indicates alternate letters (remove even-numbered letters).
'journalist' becomes 'ed' (short for editor).
The alternate letters of 'posh' are 'ps'.
'cor'+'ps'+'ed'='CORPSED'

(Another definition for corpsed that I've seen is " was unable to proceed on stage".)

I've seen this clue in The Guardian.

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