Ammo is exploding in plant (6)
I believe the answer is:
mimosa
'plant' is the definition.
(mimosa is a kind of plant)
'ammo is exploding' is the wordplay.
'exploding' is an anagram indicator.
'ammo'+'is'='ammois'
'ammois' is an anagram of 'MIMOSA'.
'in' acts as a link.
(Other definitions for mimosa that I've seen before include "Australian acacia tree" , "Sensitive plant genus; so maim (anag.)" , "Tree with scented clustered flowers" , "Sensitive thing growing" , "Tropical tree or shrub with clusters of fragrant flowers" .)