Significantly, it may be worn (5)

I believe the answer is:

badge

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'it may be worn' is the definition.
The definition suggests a singular noun which matches the answer.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for badge that I've seen before include "medal" , "Form of identification" , "Thing worn to show rank or membership" , "Shield" , "Lapel emblem" .)

I've seen this clue in the Evening Standard.

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