In convulsions, laugh turning offensive (9)

I believe the answer is:

onslaught

'offensive' is the definition.
(thesaurus)

'in convulsions laugh turning' is the wordplay.
'in' indicates a hidden word.
'ONSLAUGHT' is hidden in the letters of 'convulsions laugh turning'.

(Other definitions for onslaught that I've seen before include "Aggressive action" , "Assault" , "Barrage" , "Destructive attack" , "Sally" .)

I've seen this clue in The Telegraph.

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