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Where varnish goes immediately (2,3,4)

Ross

I believe the answer is:

on the nail

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'immediately' 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 varnish is put" , "Prompt" , "Where a coat may be hung" , "Exact" , "Promptly" .)

I've seen this clue in The Daily Express.
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