End product is superior and provides endless value for what is now the Ellice Islands (6)
I believe the answer is:
tuvalu
'islands' is the definition.
Both the answer and definition are plural nouns.
Maybe there's an association between them I don't understand?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for tuvalu that I've seen before include "[PACIFIC ISLAND]s" , "SW Pacific country" , "South Pacific coral island group" , "Pacific island country" , "Polynesian country, independent from the UK since 1978, formerly the Ellice Islands" .)