Large antelope from eastern country (5)
I believe the answer is:
eland
'large antelope' is the definition.
(I've seen this before)
'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 "Animal's" , "Laden (anag.); antelope" , "African beast" , "Ruminant" , "Antelope seen by Africans" .)