Crossword Genius

Royal domain in actual miles (5)

Ross

I believe the answer is:

realm

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

'actual miles' is the wordplay.
'actual' becomes 'real' (synonyms).
'miles' becomes 'm' (common abbreviation).
'real'+'m'='REALM'

'in' is the link.

(Other definitions for realm that I've seen before include "Kingdom; field of interest" , "Area of knowledge under discussion" , "Area of interest/activity" , "Knowledge base" , "Area of influence" .)

I've seen this clue in The Times and The Telegraph.
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