Create fashionable outlet (6)
I believe the answer is:
invent
'create' is the definition.
(I've seen this in another clue)
'fashionable outlet' is the wordplay.
'fashionable' becomes 'in' (in can mean fashionable or trendy).
'outlet' becomes 'vent' (a vent is an outlet or opening).
'in'+'vent'='INVENT'
(Other definitions for invent that I've seen before include "Create like Edison" , "Devise (something new)" , "Make or design something original" , "Cook up" , "Come up with" .)