Creature from eastern terrain (5)
I believe the answer is:
eland
'creature' is the definition.
(eland is a type of antelope)
'eastern terrain' is the wordplay.
'eastern' becomes 'e'.
'terrain' becomes 'land' (I've seen this before).
'e'+'land'='ELAND'
'from' is the link.
(Other definitions for eland that I've seen before include "African mammal" , "Largest living antelope" , "game animal" , "Browser" , "Wild beast" .)