Resort site: Arcadia (it's part of the Med) (8,3)
I believe the answer is:
adriatic sea
'part of the med' is the definition.
'resort site arcadia' is the wordplay.
'resort' is an anagram indicator.
'site'+'arcadia'='sitearcadia'
'sitearcadia' anagrammed gives 'ADRIATIC SEA'.
'it's' is the link.
(Other definitions for adriatic sea that I've seen before include "Quantity of liquid" , "It lies between Italy and the Balkan peninsula" , "large body of water" , "Greek resort area" , "It lies between Italy and the Balkans" .)