Crossword Genius

An unconscious pedestrian (12)

Ross

I believe the answer is:

somnambulist

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'an unconscious pedestrian' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

This is all the clue.

Can you help me to learn more?

(Another definition for somnambulist that I've seen is " Sleepwalker".)

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