Art returned by fellows in charge of vehicles (7)
I believe the answer is:
traffic
'vehicles' is the definition.
(I've seen this before)
'art returned by fellows in charge' is the wordplay.
'returned' is a reversal indicator.
'by' is a charade indicator (letters next to each other).
'fellows' becomes 'ff' (an abbreviation for fellow written twice).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'art' backwards is 'tra'.
'tra'+'ff'+'ic'='TRAFFIC'
'of' acts as a link.
(Other definitions for traffic that I've seen before include "Communications" , "Deals" , "Vehicles coming and going" , "wheels?" , "What uses road" .)