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That of a monarch with only half a domain? (7)


I believe the answer is:


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Here is my best explanation:

'that of a' is the definition.
I can't tell whether this definition defines the answer.

'monarch with only half a domain?' is the wordplay.
'monarch' becomes 'king' (king is a kind of monarch).
'with' is a charade indicator (letters next to each other).
'only half' indicates taking half.
'domain' halved is 'dom'.

Can you help me to learn more?

This clue was last seen in Evening Standard