Stag Pop butchered as an expedient (7)
I believe the answer is:
stopgap
'an expedient' is the definition.
(stopgap is a kind of expedient)
'stag pop butchered' is the wordplay.
'butchered' indicates an anagram (I've seen this in other clues).
'stag'+'pop'='stagpop'
'stagpop' is an anagram of 'STOPGAP'.
'as' acts as a link.
(Other definitions for stopgap that I've seen before include "caretaker" , "Provisional" , "Temporary expedient" , "Improvisation" , "Temporary measure" .)