King-size is unusually large (5)

I believe the answer is:

regal

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'king-size' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I can't see?

'unusually large' is the wordplay.
'unusually' is an anagram indicator.
'large' anagrammed gives 'REGAL'.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for regal that I've seen before include "Like a queen?" , "Kingly glare?" , "Imperial, majestic" , "King-like" , "Befitting a monarch" .)

I've seen this clue in The Globe and Mail.

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