Turn to account, one associated with action hero? (7)
I believe the answer is:
exploit
This clue is a double definition.
'turn to account' is the first definition.
(to turn something to account is to use it)
'one associated with action hero?' is the second definition.
(heroic exploits)
(Other definitions for exploit that I've seen before include "put to good use" , "Take full advantage of escapades?" , "Bunk" , "Make use of - achievement" , "Fleece?" .)