Spinning pants used by a right-winger (8)
I believe the answer is:
rotatory
'spinning' is the definition.
(rotatory describes something which rotates)
'pants used by a right-winger' is the wordplay.
'pants' becomes 'rot' (both can mean rubbish or nonsense).
'used by' means one lot of letters go next to another.
'right-winger' becomes 'Tory' (Tory is an example).
'rot'+'a'+'tory'='ROTATORY'
(Other definitions for rotatory that I've seen before include "Going round" , "Revolving about an axis" , "Turning like a wheel" , "Revolutionary" , "Associated with spinning" .)