Steal from fashionable man (5)
I believe the answer is:
robin
'man' is the definition.
'steal from fashionable' is the wordplay.
'steal from' becomes 'rob' (I've seen this before).
'fashionable' becomes 'in' ('in' can be similar in meaning to 'fashionable').
'rob'+'in'='ROBIN'
(Other definitions for robin that I've seen before include "Red-breasted Christmas card bird" , "Day was one" , "Bird, killed by Sparrow" , "Small songbird" , "Bird; Batman's aide" .)