One wrecking vehicle boy reversed (6)
I believe the answer is:
vandal
'one wrecking' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'vehicle boy reversed' is the wordplay.
'vehicle' becomes 'van' (type of vehicle).
'boy' becomes 'lad' (informal term for boy).
'reversed' says the letters should be written backwards.
'lad' backwards is 'dal'.
'van'+'dal'='VANDAL'
Can you help me to learn more?
(Other definitions for vandal that I've seen before include "Person who maliciously damages things" , "Defacer or wrecker" , "Destructive type" , "Someone who wilfully damages property" , "Lout causing damage to property" .)