Crossword Genius

Deadpan European staying in one place (11)

Ross

I believe the answer is:

emotionless

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'deadpan' is the definition.
Both the answer and definition are adjectives. Maybe they are linked in a way I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for emotionless that I've seen before include "lacking passion" , "Unfeeling" , "Without feelings" , "cold and hard?" , "devoid of passion" .)

I've seen this clue in The Times.
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