Vehicle taking back off shrub (3)
I believe the answer is:
bus
'vehicle' is the definition.
(bus is a kind of vehicle)
'taking back off shrub' is the wordplay.
'taking back off' means to remove the last letter.
'shrub' becomes 'bush' (synonyms).
'bush' with its final letter removed is 'BUS'.
(Other definitions for bus that I've seen before include "Road vehicle able to carry many passengers" , "Motor-coach" , "Of projectiles; (go) mad (slang)" , "Mode of public transport" , "Public transport vehicle" .)