Bishop takes public transport (5)
I believe the answer is:
buses
'public transport' is the definition.
(I've seen this before)
'bishop takes' is the wordplay.
'bishop' becomes 'B' (abbreviation for bishop in chess).
'takes' becomes 'uses' (I've seen this before).
'b'+'uses'='BUSES'
(Other definitions for buses that I've seen before include "Public transport vehicles" , "Passenger vehicles" , "Public service vehicles" .)