Crossword Genius

Where nail may be caught, getting pulled (2,3)

Ross

I believe the answer is:

on tow

'getting pulled' is the definition.
(on tow means being pulled along)

I don't understand the rest of the clue.

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

I've seen this clue in The Guardian.
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