Barrel out of wide street (4)
I believe the answer is:
road
'street' is the definition.
(I've seen this in another clue)
'barrel out of wide' is the wordplay.
'barrel' becomes 'b' (industrial abbreviation).
'out of' suggests deleting specific letters ('out of' can mean no longer having).
'wide' becomes 'broad' (synonyms).
'broad' with 'b' taken out is 'ROAD'.
(Other definitions for road that I've seen before include "Thoroughfare" , "motorway?" , "Street" , "Way to achieving a particular outcome" , "mine gallery" .)