Fans wrongly married sisters at first (8)
I believe the answer is:
admirers
'fans' is the definition.
'wrongly married sisters at first' is the wordplay.
'wrongly' indicates anagramming the letters (I've seen this in other clues).
'at first' suggests taking the first letters.
The initial letter of 'sisters' is 's'.
'married' is an anagram of 'admirer'.
'admirer'+'s'='ADMIRERS'
(Other definitions for admirers that I've seen before include "Would-be boyfriends" , "Fans; devotees" , "Fans; lovers" .)