His partner is less masterly! (5)

I believe the answer is:

magog

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'his partner is less masterly' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for magog that I've seen before include "Biblical king" , "Gog's companion" , "Gog and -, City of London guardian giants" , "Last of two old giants" , "old giant" .)

I've seen this clue in the Evening Standard.

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