A donkey, some wolves, perhaps, and endless impala but no pa! (4,6)
I believe the answer is:
pack animal
'a donkey' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Maybe there's an association between them I don't understand?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for pack animal that I've seen before include "it humps loads" , "Mule, for example" , "llama, perhaps" .)