Island nation has five, right behind urn (7)
I believe the answer is:
samovar
'urn' is the definition.
(I know that samovar is a type of urn)
'island nation has five right behind' is the wordplay.
'island nation' becomes 'samoa' (country made up of several islands).
'has' is an insertion indicator.
'five' becomes 'V' (Roman numeral).
'right' becomes 'r' (abbreviation).
'behind' is a charade indicator (letters next to each other).
'samoa' enclosing 'v' is 'samova'.
'samova'+'r'='SAMOVAR'
(Other definitions for samovar that I've seen before include "Russian tea-urn" , "tea provider" , "Russian urn to boil water for tea" , "tea maker" , "source of drink" .)