In Naples, tuna stew is a bit yucky (10)

I believe the answer is:

unpleasant

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'yucky' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'in naples tuna stew is a bit' is the wordplay.
'naples tuna' anagrams to 'UNPLEASANT'.
However, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for unpleasant that I've seen before include "Obnoxious" , "not agreeable" , "Not nice" , "rude" , "Objectionable" .)

I've seen this clue in the Sydney Morning Herald.

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