La Costa resort by the sea (7)
I believe the answer is:
coastal
'by the sea' is the definition.
(I've seen this before)
'la costa resort' is the wordplay.
'resort' indicates anagramming the letters.
'la'+'costa'='lacosta'
'lacosta' anagrammed gives 'COASTAL'.
(Other definitions for coastal that I've seen before include "Close to the shore" , "on the beach?" , "Near the sea" , "along shore" , "Bordering the sea" .)