Attacking player in the match? (7)
I believe the answer is:
striker
I believe this clue is a double definition.
'attacking player' is the first definition.
(I've seen this before)
'the match?' is the second definition.
(I've seen this before)
'in' is the link.
(Other definitions for striker that I've seen before include "One expected to score in football" , "Goalscorer" , "Batsman facing the bowling" , "one who's out?" , "Someone facing" .)