___ extinguisher (4)
I believe the answer is:
fire
'extinguisher' is the definition.
(synonyms)
This is all the clue.
(Other definitions for fire that I've seen before include "Shoot; sack" , "Dismiss; bake in a kiln" , "There's no smoke without it" , "Sack; conflagration" , "Flame - dismiss - shoot" .)