Lit, fired (7)
I believe the answer is:
ignited
I believe this clue is a double definition.
'lit' is the first definition.
(synonyms)
'fired' is the second definition.
(fire can mean to ignite or trigger)
(Other definitions for ignited that I've seen before include "Lit" , "fired" , "Set on fire" , "Gin diet (anag.)" , "Sparked off" .)