Animal, better left in two areas, sent west (6)
I believe the answer is:
alpaca
'animal' is the definition.
(South American animal)
'better left in two areas sent west' is the wordplay.
'better' becomes 'cap' (I've seen this before).
'left' becomes 'al' (I've seen this in other clues).
'in' is an insertion indicator.
'two areas' becomes 'a' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sent west' shows that the letters should be reversed in order (letters written left to right or 'east to west').
'cap' inserted inside 'al' is 'acapl'.
'acapl'+'a'='acapla'
'acapla' back-to-front is 'ALPACA'.
Can you help me to learn more?
(Other definitions for alpaca that I've seen before include "Break down (food)" , "Silky cloth" , "Woolly mammal" , "Type of wool" , "(Woollen cloth from) relative of llama" .)