Crossword Genius

Detailed regalia intended to cloak common unimportance (14)

Ross

I believe the answer is:

insignificance

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'unimportance' is the definition.
(I know that insignificance is a type of unimportance)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for insignificance that I've seen before include "The quality of trifles" , "Unimportance" .)

I've seen this clue in the Sydney Morning Herald.
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