Crossword Genius

One murders macho monarch (7)

Ross

I believe the answer is:

butcher

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'one murders macho monarch' is the definition.
I can't tell whether this defines the answer.

'macho monarch' is the wordplay.
'macho' becomes 'butch' (synonyms).
'monarch' becomes 'ER' (abbreviation for Elizabeth Regina, British Queen).
'butch'+'er'='BUTCHER'

Can you help me to learn more?

(Other definitions for butcher that I've seen before include "Meat seller" , "more macho" , "Slaughter" , "Kill brutally" , "Meat purveyor" .)

I've seen this clue in The Sun.
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