All the wildlife from an unknown northern area, originally (5)
I believe the answer is:
fauna
'all the wildlife' is the definition.
(fauna means the wildlife of a particular area)
'from an unknown northern area originally' is the wordplay.
'originally' suggests taking the first letters.
The first letters of 'from an unknown northern area' is 'FAUNA'.
(Other definitions for fauna that I've seen before include "Animal life of given region" , "Animals of an area or period" , "Animal kingdom" , "Animal life of an area" , "The animals found in a particular area" .)