Sends on attacking players (8)
I believe the answer is:
forwards
I believe this clue is a double definition.
'sends on' is the first definition.
('forward' can be a synonym of 'send on')
'attacking players' is the second definition.
(I've seen this before)
(Other definitions for forwards that I've seen before include "Attacking players" , "Ahead in time; in the normal order" , "Football players" , "Passes on" , "attackers" .)