Anger about traditional fashion industry (3,5)
I believe the answer is:
rag trade
'fashion industry' is the definition.
(I've seen this before)
'anger about traditional' is the wordplay.
'anger' becomes 'rage' (rage is a kind of anger).
'about' means one lot of letters goes inside another.
'traditional' becomes 'trad' (abbreviation - especially in music 'trad jazz').
'rage' going around 'trad' is 'RAG TRADE'.
(Other definitions for rag trade that I've seen before include "Informally, the clothing business" , "Slang for the garment industry" , "Fashion industry (informal)" , "dressmaking competition" , "The fashion business" .)