Bird no longer found in second area (3)
I believe the answer is:
moa
'bird no longer' is the definition.
(I've seen this before)
'second area' is the wordplay.
'second' becomes 'mo' (both are short periods of time).
'area' becomes 'a' (maths abbreviation).
'mo'+'a'='MOA'
'found in' acts as a link.
(Other definitions for moa that I've seen before include "Bird lost" , "Extinct large flightless NZ bird" , "Gigantic extinct bird" , "Flightless bird once found in New Zealand" , "Bird's gone for ever" .)