Gun found in holster: I fled (5)
I believe the answer is:
rifle
'gun' is the definition.
(rifle is a kind of gun)
'in holster i fled' is the wordplay.
'in' says the answer is hidden in the clue.
'RIFLE' can be found hidden inside 'holster i fled'.
'found' acts as a link.
(Other definitions for rifle that I've seen before include "shoot?" , "Pillage; a weapon" , "Gun - ransack" , "Long-barrelled weapon, normal army equipment" , "Search with intent to steal" .)