Thief pilfers hot new fashion (10)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
shoplifter
'thief' is the definition.
(shoplifter is a kind of thief)
'pilfers hot new fashion' is the wordplay.
'new fashion' indicates an anagram.
'pilfers'+'hot'='pilfershot'
'pilfershot' anagrammed gives 'SHOPLIFTER'.
(Other definitions for shoplifter that I've seen before include "Thief" , "Thieving customer" , "Criminal (in a retail context)" , "Robber" , "guilty party" .)