Bank robber is pretty Scottish (6)

I believe the answer is:

bonnie

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'scottish' is the definition.
Although both the answer and definition are adjectives, I can't understand how one could define the other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for bonnie that I've seen before include "One of two gangsters" , "The Young Pretender" , "attractive to northerners" , "Clyde's partner" , "Pretty" .)

I've seen this clue in The Times.

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