Crossword Genius

What makes hum as it explodes? (5,4)

Ross

I believe the answer is:

stink bomb

(Other definitions for stink bomb that I've seen before include "Device containing sulphurous matter traditionally loved by naughty boys" , "Prankster's smelly explosive" , "Device letting off unpleasant smell when opened - reeking explosive" , "Malodorous pellet" , "Smelly device let off by a schoolboy" .)

I've seen this clue in The Sun.
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