Am all bent on backing the beast! (5)

I believe the answer is:

llama

I'm a little stuck... Click here to teach me more about this clue!

'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' is an anagram of 'lla'.
'am' inserted into 'lla' is 'LLAMA'.

'backing the' acts as a link.
I am not very happy about this link. Some or all of it may be part of 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" .)

I've seen this clue in the Evening Standard.

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