Wedding day ultimately ruined after bride's heart rejected somewhere in Wales (7)

I believe the answer is:

gwynedd

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'wales' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see an association between them that I don't see?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for gwynedd that I've seen before include "County of north-west Wales" , "Area of north-west Wales" , "Bangor's county" , "Welsh county" .)

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