Crossword Genius

My one is explosive (4)

Ross

I believe the answer is:

mine

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'is explosive' is the definition.
(e.g. a landmine)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for mine that I've seen before include "Pit; explosive device" , "Pit; source" , "Store" , "Explosive device concealed in ground" , "I made?" .)

I've seen this clue in The Mirror.
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