Well, it's not distasteful in a manner of speaking (4)

I believe the answer is:

sick

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'well' is the definition.
Both the definition and answer are adjectives. Perhaps there's an association between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for sick that I've seen before include "not good" , "Infirm" , "well? Hardly" , "Ill, unwell" , "Ill; nauseous" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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