Scrap book, fashionable (3)
I believe the answer is:
bin
'scrap' is the definition.
(I've seen this in other clues)
'book fashionable' is the wordplay.
'book' becomes 'b' (abbreviation for book).
'fashionable' becomes 'in' (in can mean fashionable or trendy).
'b'+'in'='BIN'
(Other definitions for bin that I've seen before include "Graves seen here" , "Domestic receptacle for rubbish" , "Where to put rubbish" , "Waste container" , "Litter container" .)