Crossword Genius

Land crumbling into sea (7)

Ross

I think it could be either:

grenada

estonia
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'land' is the definition.
(Grenada is an example)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for grenada that I've seen before include "West Indian country" , "Island just north of Trinidad" , "West Indian island" , "Nation" , "commonwealth state" .)

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