Invader's opponent (8)
I believe the answer is:
defender
(Other definitions for defender that I've seen before include "Protector" , "Advocate" , "Goalkeeper" , "Guard - champion" , "One on team" .)
I believe the answer is:
defender
(Other definitions for defender that I've seen before include "Protector" , "Advocate" , "Goalkeeper" , "Guard - champion" , "One on team" .)