Remove all traces (7)

I believe the answer is:

unhitch

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'remove' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how one could define the other.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for unhitch that I've seen before include "Unhook, unfasten" , "free?" , "Separate" , "Release" , "Disconnect" .)

I've seen this clue in The Globe and Mail, The Irish News and The Irish Independent.

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