Black couple to protect composer reversing in road (9)
I believe the answer is:
boulevard
'road' is the definition.
(boulevard is a kind of road)
'black couple to protect composer reversing' is the wordplay.
'black' becomes 'b' (as in pencil classifications).
'couple' becomes 'duo' (synonyms).
'to protect' is an insertion indicator.
'composer' becomes 'ravel' (Maurice Ravel).
'reversing' is a reversal indicator.
'duo' going around 'ravel' is 'draveluo'.
'draveluo' back-to-front is 'oulevard'.
'b'+'oulevard'='BOULEVARD'
'in' is the link.
(Other definitions for boulevard that I've seen before include "Broad urban road" , "Long, wide avenue" , "Broad tree-lined street" , "Wide city road" , "Wide tree-lined street" .)