Crossword Genius

On snooker table, screw supports leg (8)


I believe the answer is:


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'on snooker table screw' is the definition.
I can't tell whether this definition defines the answer.

'supports leg' is the wordplay.
'supports' becomes 'backs' (backing is a kind of supporting).
'leg' becomes 'pin' (pin is a kind of leg).

Can you help me to learn more?

(Other definitions for backspin that I've seen before include "It slows or reverses a ball's forward motion" , "Rotary movement contrary to direction of travel" , "Ball's rotation" , "What gives a ball lift" , "Pink scab (anag.)" .)

I've seen this clue in The Times.
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