Sends on rugby players (8)
I believe the answer is:
forwards
This clue is a double definition.
'sends on' is the first definition.
('forward' can be a synonym of 'send on')
'rugby players?' is the second definition.
(forward is a type of rugby player)
(Other definitions for forwards that I've seen before include "Passes on" , "Sends, dispatches" , "Ahead in time; in the normal order" , "Facing towards the front" , "Football players" .)