Animal from eastern country (5)
I believe the answer is:
eland
'animal' is the definition.
(eland is a type of antelope)
'eastern country' is the wordplay.
'eastern' becomes 'e'.
'country' becomes 'land' (synonyms).
'e'+'land'='ELAND'
'from' acts as a link.
(Other definitions for eland that I've seen before include "African mammal" , "African beast" , "One browses in the African plain" , "Laden (anag.); antelope" , "Spiral-horn antelope" .)