Crossword Genius

Verge on being a sort of collie? (6)

Ross

I believe the answer is:

border

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'verge' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for border that I've seen before include "Line between countries" , "An edgy place" , "Frontier or edge as of garden" , "Rim" , "BLINK/BRINK" .)

I've seen this clue in the Evening Standard.
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