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Zero per cent tax initially after I fail to declare returns (3,1,3)

Ross

I believe the answer is:

not a bit

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'zero' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

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(Other definitions for not a bit that I've seen before include "In no way - far from it" , "In to bat (anag)" , "None" .)

I've seen this clue in The Times.
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