Native of Sri Lanka (5)
I believe the answer is:
tamil
'native of sri lanka' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tamil that I've seen before include "Member of South Indian people" , "South Indian people or language" , "Sri Lankan" , "Language of southern India and Sri Lanka" , "An official language of Sri Lanka" .)