Crossword Genius

Boss renegotiated overall sum (10)

Ross

I believe the answer is:

marvellous

'boss' is the definition.
(boss can informally mean very good)

'renegotiated overall sum' is the wordplay.
'renegotiated' indicates an anagram.
'overall'+'sum'='overallsum'
'overallsum' anagrammed gives 'MARVELLOUS'.

(Other definitions for marvellous that I've seen before include "def" , "Amazing" , "Fantastic" , "inspiring wonder" , "Wonderful" .)

I've seen this clue in The Telegraph.
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