Roam over island for the language? (5)
I believe the answer is:
maori
'the language?' is the definition.
(Maori is an example)
'roam over island' is the wordplay.
'over' says the letters should be written backwards.
'island' becomes 'i'.
'roam' written backwards gives 'maor'.
'maor'+'i'='MAORI'
'for' is the link.
(Other definitions for maori that I've seen before include "NZ Polynesian language" , "Native Kiwi" , "Polynesian aboriginal" , "Cook Islander" , "Member of New Zealand's aboriginal people" .)