Simon's laughter conceals an assault (9)

I believe the answer is:

onslaught

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

'simon's laughter conceals' is the wordplay.
'conceals' indicates a hidden word.
'ONSLAUGHT' is hidden within 'simons laughter'.

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

I've seen this clue in The Daily Express.

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