Goes with composer in backstreet? (7)
I believe the answer is:
travels
'goes' is the definition.
(traveling is a kind of going)
'composer in backstreet?' is the wordplay.
'composer' becomes 'ravel' (Maurice Ravel).
'in' means one lot of letters goes inside another.
'backstreet?' becomes 'ts' ('st' backwards).
'ravel' inserted inside 'ts' is 'TRAVELS'.
'with' is the link.
(Other definitions for travels that I've seen before include "journeyman's accounts" , "Works as salesman" , "Goes from one place to another" , "Voyages" , "See 10 Down" .)