Witnessed animal bearing litter (5)
I believe the answer is:
sedan
'witnessed animal bearing litter' is the definition.
'sedan' can be an answer for 'litter' (sedan is a kind of litter). I'm not sure about the 'witnessed animal bearing' bit.
'bearing litter' is the wordplay.
'bearing' becomes 'se' (south east, a compass bearing).
'litter' becomes 'dan' (I can't justify this - if you can you should believe this answer much more).
'se'+'dan'='SEDAN'
Can you help me to learn more?
(Other definitions for sedan that I've seen before include "outmoded form of transport" , "Battle in 1940" , "Once a mobile chair for Danes" , "Palanquin; car" , "big chair" .)