Crossword Genius

A sign that your car's not working? (2,3)


I believe the answer is:

on tow

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

'a sign that your car's' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'not working?' is the wordplay.
I cannot really see how this works, but
an anagram of 'not' is 'ont' which is located in the answer.
The remaining letters 'ow' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for on tow that I've seen before include "Being drawn" , "Being pulled along" , "being strung along?" , "being pulled by trucker?" , "A caravan is usually" .)

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