An aspect of spin? (4)
I believe the answer is:
side
I believe this clue is a double definition.
'an aspect' is the first definition.
(side is a kind of aspect)
'spin?' is the second definition.
(side is a kind of spin)
'of' is the link.
(Other definitions for side that I've seen before include "Not the main" , "Position to the right or left of" , "Neighbourhood" , "[MAN U], perhaps" , "Bank" .)