Scrap unfashionable dish (6)
I believe the answer is:
ragout
'dish' is the definition.
(ragout is a kind of dish)
'scrap unfashionable' is the wordplay.
'scrap' becomes 'rag' (I've seen this before).
'unfashionable' becomes 'out' ('out' can be a synonym of 'unfashionable').
'rag'+'out'='RAGOUT'
(Other definitions for ragout that I've seen before include "Well-seasoned stew of vegetables" , "Tasty stew" , "Seasoned stew of meat and vegetables" , "Meat and vegetable dish" , "Seasoned dish of stewed meat and vegetables" .)