Errant Don, I, with a fiasco for the fans? (11)
I believe the answer is:
aficionados
'the fans?' is the definition.
(an aficionado is a fan of something)
'errant don i with a fiasco' is the wordplay.
'errant' indicates anagramming the letters (I've seen this in other clues).
'with' means one lot of letters go next to another.
'don'+'i'+'a'+'fiasco'='doniafiasco'
'doniafiasco' is an anagram of 'AFICIONADOS'.
'for' is the link.
(Other definitions for aficionados that I've seen before include "Knowledgeable enthusiasts" , "Experts in their fields" , "fans" .)