Royal domain (5)

I believe the answer is:

realm

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

This is all the clue.

(Other definitions for realm that I've seen before include "World" , "Area of influence" , "region" , "Monarchy" , "Area of interest/activity" .)

I've seen this clue in the Penny Press, the Evening Standard, the Sydney Morning Herald, the USA Today, the Newsday, the LA Times and The Star Tribune.

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