Fashion is about - and I'm eager (9)
I believe the answer is:
ambitious
'eager' is the definition.
(thesaurus)
'fashion is about and i'm' is the wordplay.
'fashion' is an anagram indicator.
'and' is a charade indicator (letters next to each other) (I've seen this in other clues).
'is'+'about'='isabout'
'isabout' put after 'im' is 'imisabout'.
'imisabout' with letters rearranged gives 'AMBITIOUS'.
(Other definitions for ambitious that I've seen before include "Keen to succeed" , "Desiring success" , "Bold - pushy" , "Aspirant" , "Intent on achievements" .)