Fan his aunt set spinning (10)
I believe the answer is:
enthusiast
'fan' is the definition.
(I know that fan can be written as enthusiast)
'his aunt set spinning' is the wordplay.
'spinning' indicates anagramming the letters.
'his'+'aunt'+'set'='hisauntset'
'hisauntset' is an anagram of 'ENTHUSIAST'.
(Other definitions for enthusiast that I've seen before include "Fan" , "One deeply interested in a subject" , "buff" , "one not at all cool" , "Devotee" .)