Crossword Genius

Reportedly, where nail might be being drawn (2,3)

Ross

I believe the answer is:

on tow

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'be being drawn' is the definition.
(I've seen this before)

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

Can you help me to learn more?

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

I've seen this clue in The Daily Express.
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