Maurice upset Laver (5)

I believe the answer is:

ravel

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'maurice' is the definition.
Both the answer and definition are singular nouns.
Maybe there's an association between them I don't understand?

'upset laver' is the wordplay.
'upset' is an anagram indicator.
'laver' anagrammed gives 'RAVEL'.

Can you help me to learn more?

(Other definitions for ravel that I've seen before include "He scored" , "Musician" , "Tangle - untangle - French composer, d. 1937" , "Bolero's composer" , "Fray; composer" .)

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