Crossword Genius

He ruled alone one day (7)

Ross

I believe the answer is:

solomon

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'he ruled' is the definition.
The definition suggests a singular noun which matches the answer.

'alone one day' is the wordplay.
'alone' becomes 'solo' (as in a musical solo).
'one day' becomes 'mon' (abbreviation for Monday).
'solo'+'mon'='SOLOMON'

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(Other definitions for solomon that I've seen before include "King of Israel with great wisdom" , "Short-lived" , "King known for wisdom" , "Wise man" , "wise guy" .)

I've seen this clue in the Evening Standard.
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