Health resort in country (5)
I believe the answer is:
spain
'country' is the definition.
(Spain is a country)
'health resort in' is the wordplay.
'health resort' becomes 'spa' (spa can mean a health resort).
'spa'+'in'='SPAIN'
(Other definitions for spain that I've seen before include "holiday country" , "Iberian country" , "location of Estoril" , "Kingdom" , "part of Europe" .)