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European Head of State hosted by e.g. Boris Johnson (8)

Ross

I believe the answer is:

estonian

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'european' is the definition.
(person from Estonia)

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

Can you help me to learn more?

(Other definitions for estonian that I've seen before include "Native of a Baltic republic" , "Eastern Europe" , "Eastern European" , "Baltic state native" , "European language" .)

I've seen this clue in The Guardian.
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