Passenger vehicle returns from trade centre (4)
I believe the answer is:
mart
'trade centre' is the definition.
'passenger vehicle returns' is the wordplay.
'passenger vehicle' becomes 'tram' (I've seen this before).
'returns' is a reversal indicator.
'tram' reversed gives 'MART'.
'from' is the link.
(Other definitions for mart that I've seen before include "Place" , "Take tram to market" , "Trading centre" , "US shop; market" .)