Cut timber in a vehicle (7)
I believe the answer is:
slashed
'cut' is the definition.
(I know that cut can be written as slashed)
'timber in a vehicle' is the wordplay.
'timber' becomes 'ash' (I've seen this before).
'in' means one lot of letters goes inside another.
'a vehicle' becomes 'sled' (sled is a kind of vehicle).
'ash' inserted within 'sled' is 'SLASHED'.
(Other definitions for slashed that I've seen before include "vandalised?" , "Cut or gashed with knife, being hassled" .)