Tax nicely adjusted? Not quite! (9)

I believe the answer is:

inexactly

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'not quite' is the definition.
Both the answer and definition are adverbs. Maybe there's a link between them I don't understand?

'tax nicely adjusted?' is the wordplay.
'adjusted?' is an anagram indicator.
'tax'+'nicely'='taxnicely'
'taxnicely' with letters rearranged gives 'INEXACTLY'.

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(Other definitions for inexactly that I've seen before include "not true to form" , "Imprecisely" , "Tax nicely (anag.)" , "Not quite accurately" , "Without precision" .)

I've seen this clue in The Times.

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