Going to pieces without pot? That's not very nice (4)

I believe the answer is:

icky

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

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for icky that I've seen before include "Revolting" , "Cloying -- repulsive" , "Rotten - unpleasantly gooey" , "Very bad" , "horrid" .)

I've seen this clue in The Telegraph.

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