Footballers fix what Federer sometimes produces on court (8)
I believe the answer is:
backspin
'what federer sometimes produces on court' is the definition.
I can't tell whether this definition defines the answer.
'footballers fix' is the wordplay.
'footballers' becomes 'backs' (back is a kind of footballer).
'fix' becomes 'pin' (to pin is to fix in place).
'backs'+'pin'='BACKSPIN'
Can you help me to learn more?
(Other definitions for backspin that I've seen before include "Rotary movement contrary to direction of travel" , "Ball's rotation" , "Lifting rotation of ball" , "It slows or reverses a ball's forward motion" , "What gives a ball lift" .)