Not insignificant regal order (5)

I believe the answer is:

large

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'not insignificant' is the definition.
I can't judge whether this defines the answer.

'regal order' is the wordplay.
'order' is an anagram indicator.
'regal' anagrammed gives 'LARGE'.

Can you help me to learn more?

(Other definitions for large that I've seen before include "Stout" , "Big, almost regal" , "At which criminals possibly are free" , "Chunky" , "Lake" .)

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

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