One removes former motor vehicle (9)
I believe the answer is:
extractor
'one removes' is the definition.
'former motor vehicle' is the wordplay.
'former' becomes 'ex'.
'motor vehicle' becomes 'tractor' (tractor is a kind of motor vehicle).
'ex'+'tractor'='EXTRACTOR'
(Other definitions for extractor that I've seen before include "Variety of fan" , "Juice-maker" , "Eg, kitchen fan" , "Device for removing air from a space" , "dentist" .)