Crossword Genius

Where one might strike a hammer without delay (2,3,4)

Ross

I believe the answer is:

on the nail

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'without delay' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for on the nail that I've seen before include "Where a hammer might go" , "Where varnish is put" , "Exact" , "focus of manicurist?" , "Prompt" .)

I've seen this clue in The Hindu.
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