Crossword Genius

Butch is said to be a match for nothing (5)

Ross

I believe the answer is:

macho

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'butch' is the definition.
(synonyms)

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(Other definitions for macho that I've seen before include "Affectedly virile" , "Like aggressive male" , "Exaggeratedly masculine" , "Blokeish" , "Aggressively male" .)

I've seen this clue in the Evening Standard.
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