A Scottish one (3)

I believe the answer is:

yin

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'a scottish one' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

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(Other definitions for yin that I've seen before include "Complement of yang" , "Comedian Billy Connolly is the big one" , "Yang's counterpart" , "Chinese female passive principle of universe" , "principle accepted in China" .)

I've seen this clue in the Evening Standard.

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