Partisan from Gunners it turned out (9)
I believe the answer is:
insurgent
'partisan' is the definition.
'gunners it turned out' is the wordplay.
'turned out' is an anagram indicator.
'gunners'+'it'='gunnersit'
'gunnersit' with letters rearranged gives 'INSURGENT'.
'from' acts as a link.
(Other definitions for insurgent that I've seen before include "freedom fighter" , "Revolting" , "Unresting like a rebel" , "rising" , "Rebel, revolutionary" .)