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A capital seat I snuggle into (5)

Ross

I believe the answer is:

sofia

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'a capital' is the definition.
(capital of Bulgaria)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for sofia that I've seen before include "European city" , "Capital of Bulgaria" , "Bulgarian capital" , "capital city" , "capital place" .)

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