Crossword Genius

Device for catching someone unawares (5,4)

Ross

I believe the answer is:

booby trap

(Other definitions for booby trap that I've seen before include "Device for practical joke" , "Lethal or playful device set off by victim" , "Hazard for the unwary" , "Unexpected explosive device" , "concealed danger" .)

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