Islander was eaten, unfortunately eating one (9)
I believe the answer is:
taiwanese
'islander' is the definition.
(Taiwan is an island)
'was eaten unfortunately eating one' is the wordplay.
'unfortunately' is an anagram indicator (a bad or unfortunate spelling).
'eating' is an insertion indicator.
'one' becomes 'I' (Roman numeral).
'was'+'eaten'='waseaten'
'waseaten' anagrammed gives 'tawanese'.
'tawanese' placed around 'i' is 'TAIWANESE'.
(Other definitions for taiwanese that I've seen before include "oriental in character" , "Oriental type" , "Islander" , "These islanders" , "from Asia" .)