Destructive lad jumping up on the back of a vehicle (6)
I believe the answer is:
vandal
'destructive lad jumping up on the back of a vehicle' is the definition.
I can't judge whether this defines the answer.
'destructive lad jumping up on the back of a vehicle' is the wordplay.
'destructive' is an anagram indicator (I've seen this in other clues).
'jumping' means one lot of letters goes inside another (some letters jump around or over others).
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'the back of' suggests the final letters (I've seen 'back' mean this).
'vehicle' becomes 'v' (this could be a standard abbreviation I've not previously seen).
The last letter of 'on' is 'n'.
'n'+'a'+'v'='nav'
'nav' reversed gives 'van'.
'lad' anagrammed gives 'dal'.
'dal' placed around 'van' is 'VANDAL'.
Can you help me to learn more?
(Other definitions for vandal that I've seen before include "Ger. tribesman; one who damages property" , "Someone who destroys or defaces property" , "Person who maliciously damages things" , "Defacer or wrecker" , "One who damages things maliciously" .)