My one is explosive (4)
I believe the answer is:
mine
'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?" .)