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If good-heated would be regal, it's true (4)

Ross

I believe the answer is:

real

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'true' is the definition.
(synonyms)

I don't understand how the rest of the clue works.

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(Other definitions for real that I've seen before include "In America, this estate comprises land and buildings" , "---- Madrid, Spanish football club" , "Unaffected" , "Actual, not imaginary" , "Spanish football team" .)

I've seen this clue in the Evening Standard.
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