English can enter French road by train (7)
I believe the answer is:
retinue
'train' is the definition.
(thesaurus)
'english can enter french road' is the wordplay.
'english' becomes 'e' (abbreviation).
'can' becomes 'tin' ('tin' can be a synonym of 'can').
'enter' is an insertion indicator.
'french road' becomes 'rue'.
'e'+'tin'='etin'
'etin' going into 'rue' is 'RETINUE'.
'by' acts as a link.
(Other definitions for retinue that I've seen before include "Body of retainers" , "Band of attendants" , "Cortege" , "Group of assistants" , "Group following an important person" .)