Crossword Genius

Boom source (3)

Ross

I believe the answer is:

tnt

'boom source' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for tnt that I've seen before include "Explosive compound" , "Explosive stuff" , "Initially, powerful explosive" , "Very powerful explosive, compressed" , "Type of high explosive" .)

I've seen this clue in The Washington Post, The Wall Street Journal, the L.A. Times Daily, the New York Times and the Universal.
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