Caribbean country, capital Castries (2,5)

I believe the answer is:

st lucia

(Other definitions for st lucia that I've seen before include "Caribbean country" , "Windward Isles country to the south of Martinique" , "'Volcanic island in the Windward Isles (2,5)'" , "Commonwealth country in the Windward Islands" .)

I've seen this clue in The Guardian.

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