Crossword Genius

Land crumbling into sea (7)

Ross

I think it could be either:

grenada

estonia

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But I've got no explanation for this one! Could you help me understand?

(Other definitions for estonia that I've seen before include "On a site (anag)" , "Baltic republic, capital Tallinn" , "European country, capital Tallinn" , "Republic in northeastern Europe" , "'So eat in here in Tallinn, say (7)'" .)

I've seen this clue in The Daily Express, The Everyman puzzle in The Observer and The Times.
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