Not exactly tasty; unpleasant, in fact (5)

I believe the answer is:

nasty

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'not exactly tasty unpleasant in' is the definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for nasty that I've seen before include "Beastly" , "grave" , "Foul" , "Not nice" , "Highly unpleasant" .)

I've seen this clue in the Evening Standard.

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