Break in? I'd get fired (7)
I believe the answer is:
ignited
'fired' is the definition.
(fire can mean to ignite or trigger)
'break in? i'd get' is the wordplay.
'break' indicates an anagram.
'in'+'id'+'get'='inidget'
'inidget' is an anagram of 'IGNITED'.
(Other definitions for ignited that I've seen before include "Gin diet (anag.)" , "Sparked off" , "Lit" , "Caught fire" , "fired" .)