Doubles player, with back gone, retires, giving set up (6)
I believe the answer is:
entrap
'set up' is the definition.
('entrap' can be a synonym of 'set up')
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for entrap that I've seen before include "Snare, trick" , "Catch - frame" , "Frame -- stitch up" , "net" , "Set up" .)