Kills for winter vehicles, say (5)
I believe the answer is:
slays
'kills' is the definition.
(slaying is a kind of killing)
'winter vehicles say' is the wordplay.
I cannot really see how this works, but
an anagram of 'say' is 'ays' which is within the answer.
This may be the basis of the clue (or it may be nonsense).
'for' is the link.
Can you help me to learn more?
(Other definitions for slays that I've seen before include "Violently kills" , "Kills intentionally" .)