It's not pleasant after papa becomes fussy (4)

I believe the answer is:

icky

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

I don't understand the remainder of the clue.

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

I've seen this clue in The Irish Times.

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