Am all bent on backing the beast! (5)
I believe the answer is:
llama
'beast' is the definition.
(I've seen this before)
'am all bent on' is the wordplay.
'bent' indicates anagramming the letters.
'on' indicates putting letters inside (as in clothing \'on\' a person).
'all' with letters rearranged gives 'lla'.
'am' placed within 'lla' is 'LLAMA'.
'backing the' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for llama that I've seen before include "Camel-like wool source" , "As bearer of burdens" , "Load-carrier" , "Fleecy mammal" , "Andean pack animal" .)