Get away with wrecking cars a lot (5)
I believe the answer is:
scram
'get away' is the definition.
(I've seen this before)
'with wrecking cars a lot' is the wordplay.
'with' says to put letters next to each other.
'wrecking' is an anagram indicator (I've seen this in other clues).
'a lot' becomes 'm'.
'cars' anagrammed gives 'scra'.
'scra' put next to 'm' is 'SCRAM'.
(Other definitions for scram that I've seen before include "In slang, go away and beat it" , "Vamoose" , "Scarper" , "beat hasty retreat" , "Clear off!" .)