Footwear by which the Irish may be identified (6)

I believe the answer is:

brogue

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'footwear' is the definition.
(I know that brogue is a type of shoe)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for brogue that I've seen before include "Outdoor shoe; accent" , "Kind of shoe" , "Worn" , "Marked accent" , "Irish accent or strong shoe" .)

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

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