Coach player on the bench knocked over (3)
I believe the answer is:
bus
'coach' is the definition.
(synonyms)
'player on the bench knocked over' is the wordplay.
'player on the bench' becomes 'sub' (substitute in football, for example).
'knocked over' is a reversal indicator.
'sub' written backwards gives 'BUS'.
(Other definitions for bus that I've seen before include "Means of public transport" , "Motor-coach" , "Road vehicle able to carry many passengers" , "Of projectiles; (go) mad (slang)" , "Charabanc" .)