Crossword Genius

Most disruptive cry for attention cut sleep after noon (8)

Ross

I believe the answer is:

noisiest

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'most disruptive' is the definition.
Both the answer and definition are superlative adjectives. Maybe you can see a link between them that I don't see?

I cannot understand how the remainder of the clue works.

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(Other definitions for noisiest that I've seen before include "Most rowdy" , "Making the loudest sounds" , "Biggest racket" , "Making the most sound" , "Making the most loud sounds" .)

I've seen this clue in The Times.
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