A royal domain (5)

I believe the answer is:

realm

'a royal domain' is the definition.
(realm can mean a kingdom)

This is the entire clue.

(Other definitions for realm that I've seen before include "King's domain" , "where ruler holds sway?" , "A Nation" , "Empire - state" , "Kingdom; field of interest" .)

I've seen this clue in the Evening Standard.

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