Reportedly, where nail might be being drawn (2,3)
I believe the answer is:
on tow
'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" .)