Ill-used vehicles (10)

I believe the answer is:

ambulances

I'm a little stuck... Click here to teach me more about this clue!

'vehicles' is the definition.
(ambulance is a kind of vehicle)

I don't understand the rest of the clue.

(Other definitions for ambulances that I've seen before include "plurality of emergency resources" , "Emergency vehicles" .)

I've seen this clue in The Globe and Mail.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.