Ben running around American city in part of road (3,4)
I believe the answer is:
bus lane
'part of road' is the definition.
(I know this)
'ben running around american city' is the wordplay.
'running' is an anagram indicator.
'around' indicates putting letters inside.
'american' becomes 'us' (abbreviation for United States).
'city' becomes 'LA' (Los Angeles).
'ben' anagrammed gives 'bne'.
'us'+'la'='usla'
'bne' enclosing 'usla' is 'BUS LANE'.
'in' is the link.
(Other definitions for bus lane that I've seen before include "coach may also use?" , "Road space reserved for public transport" , "prohibited carriageway" , "Dedicated section of road" , "Reserved section of road" .)