Animals from those parts to the west (4)
I believe the answer is:
apes
'animals' is the definition.
(ape is a kind of animal)
'from those parts to the west' is the wordplay.
'from' says the answer is hidden in the clue.
'to the west' is a reversal indicator.
'sepa' can be found hidden inside 'those parts'.
'sepa' reversed gives 'APES'.
(Other definitions for apes that I've seen before include "Large primates" , "Copies the primates?" , "Imitates like primates" , "Zoo animals" , "Imitates in every aspect" .)