Crossword Genius

An explosive thing? That's putting it mildly! (1-4)

Ross

I believe the answer is:

a-bomb

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

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for a-bomb that I've seen before include "Atomic weapon" , "Weapon of mass destruction" , "explosive" , "Killer" , "Nuclear weapon" .)

I've seen this clue in The Sun.
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