Animals found in Eastern regions (6)
I believe the answer is:
elands
'animals' is the definition.
(I've seen this before)
'eastern regions' is the wordplay.
'eastern' becomes 'e'.
'regions' becomes 'lands' (land is a kind of region**).
'e'+'lands'='ELANDS'
'found in' acts as a link.
(Other definitions for elands that I've seen before include "Large African antelopes" , "Animals" , "African antelopes with twisted horns" .)