A US tram adapted for island (7)
I believe the answer is:
sumatra
'island' is the definition.
(Sumatra is an example)
'a us tram adapted' is the wordplay.
'adapted' indicates anagramming the letters.
'a'+'us'+'tram'='austram'
'austram' is an anagram of 'SUMATRA'.
'for' is the link.
(Other definitions for sumatra that I've seen before include "Large island of Indonesia" , "island in Indian ocean" , "Eastern island" , "A US mart on an Indonesian island?" , "Second largest Indonesian island" .)