Crossword Genius

Bonnie's companion is a Scottish runner (5)

Ross

I believe the answer is:

clyde

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'runner' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for clyde that I've seen before include "One running between banks" , "Bonnie's partner" , "Bonnie and --, outlaws" , "Criminal" , "bank robber" .)

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