A road in French forest (5)
I believe the answer is:
arden
'forest' is the definition.
(I've seen this before)
'a road in french' is the wordplay.
'road' becomes 'rd' (abbreviation).
'in french' becomes 'en' ('en' can be French for 'in' e.g. en France).
'a'+'rd'+'en'='ARDEN'
(Other definitions for arden that I've seen before include "Shakespearean forest" , "Collection of trees" , "John --, playwright" , "The forest of --, setting for As You Like It" , "Wood in play" .)