Mangle attacking player without resistance (7)
I believe the answer is:
wringer
'mangle' is the definition.
(I've seen this before)
'attacking player without resistance' is the wordplay.
'attacking player' becomes 'winger' (I've seen this before).
'without' is an insertion indicator ('without' can be similar in meaning to 'outside').
'resistance' becomes 'r' (abbreviation).
'winger' enclosing 'r' is 'WRINGER'.
(Other definitions for wringer that I've seen before include "Old-fashioned clothes dryer" , "Old clothes dryer" , "Kitchen appliance" , "A mangle" , "trouble when put through this?" .)