Managed to bag with rifle (7)
I believe the answer is:
ransack
'rifle' is the definition.
('ransack' can be a synonym of 'rifle')
'managed to bag' is the wordplay.
'managed' becomes 'ran' (I've seen this before).
'to bag' becomes 'sack' (sack is a kind of bag).
'ran'+'sack'='RANSACK'
'with' is the link.
(Other definitions for ransack that I've seen before include "Rummage, rifle" , "Search (a place) thoroughly" , "Plunder; search ruthlessly" , "Search thoroughly - pillage" , "Examine thoroughly" .)