Square cut turns game (8)
I believe the answer is:
ninepins
'game' is the definition.
(ninepins is a kind of game)
'square cut turns' is the wordplay.
'square' becomes 'nine' (nine is a square number).
'cut' becomes 'snip' (snip is a kind of cut).
'turns' says the letters should be written backwards.
'snip' backwards is 'pins'.
'nine'+'pins'='NINEPINS'
(Other definitions for ninepins that I've seen before include "Skittles (IX, not V)" , "Form of skittles" , "Skittles, IX objects to be knocked down" , "Bowling targets" , "Bowling game" .)