Crossword Genius

Plain Welsh seaside resort, no dud (5)

Ross

I believe the answer is:

llano

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'plain' is the definition.
(a grassy plain)

I can't explain the rest of the clue.

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(Other definitions for llano that I've seen before include "Treeless area" , "Flat area" , "Treeless grassy plain in South America" , "Grassy plain in South?America" , "(South American) grassy plain" .)

I've seen this clue in The Guardian.
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