Animal from mountain area: tailless cat (6)
I believe the answer is:
alpaca
'animal' is the definition.
(thesaurus)
'mountain area tailless cat' is the wordplay.
'mountain' becomes 'alp' (alp is a kind of mountain**).
'area' becomes 'a' (maths abbreviation).
'tailless' means to remove the last letter.
'cat' with its last letter taken away is 'ca'.
'alp'+'a'+'ca'='ALPACA'
'from' acts as a link.
(Other definitions for alpaca that I've seen before include "Llama with long silky hair" , "S American animal related to llana" , "Fabric from wool of S American llama" , "Llama relation" , "South American relative of the llama" .)