Nervous laugh, terrified about massacre (9)

I believe the answer is:

slaughter

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

'nervous laugh terrified about' is the wordplay.
'about' says the answer is hidden in the clue.
'SLAUGHTER' is hidden within 'nervous laugh terrified'.

(Other definitions for slaughter that I've seen before include "best" , "Mass killing or carnage" , "Butchery" , "Butcher" , "Killing (of farm animals)" .)

I've seen this clue in The Telegraph.

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