Destruction to vehicle on surrealist's motorway (9)
I believe the answer is:
vandalism
'destruction' is the definition.
(I know that vandalism is a type of destruction)
'vehicle on surrealist's motorway' is the wordplay.
'vehicle' becomes 'van' (type of vehicle).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'surrealist's' becomes 'dali's' (Salvador Dali).
'motorway' becomes 'M' (as in motorway names - M1, M4 etc).
'van'+'dalis'+'m'='VANDALISM'
'to' is the link.
(Other definitions for vandalism that I've seen before include "property crime" , "Wanton damage" , "Graffiti artist's work" , "barbarous treatment" , "Wilful destruction" .)