Extinct bird seen in Maldives or Andamans originally (3)
I believe the answer is:
moa
'extinct bird' is the definition.
(extinct flightless bird of New Zealand)
'maldives or andamans originally' is the wordplay.
'originally' says to take the initial letters.
The initial letters of 'maldives or andamans' is 'MOA'.
'seen in' is the link.
(Other definitions for moa that I've seen before include "Early bird" , "Old bird" , "Bird no longer" , "bird that became extinct" , "Gigantic extinct bird" .)