Disappointment for fan? (4)
I believe the answer is:
blow
I believe this clue is a double definition.
'disappointment' is the first definition.
(blow can mean a setback or difficulty)
'fan?' is the second definition.
(thesaurus)
'for' is the link.
(Other definitions for blow that I've seen before include "Clip" , "Cannabis" , "Bang, wallop" , "Sudden misfortune" , "Sudden shock, wind" .)