Crossword Genius

Domain of Isambard Brunel (7)

Ross

I believe the answer is:

kingdom

I'm a little stuck... Click here to teach me more about this clue!

'domain' is the definition.
(I know that kingdom is a type of domain)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for kingdom that I've seen before include "For one animal" , "State with a monarchy" , "What Richard III would have given for a horse" , "big territory?" , "Regal realm" .)

I've seen this clue in the Evening Standard.
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