Some small Amazonian animal (5)
I believe the answer is:
llama
'animal' is the definition.
(I've seen this before)
'some small amazonian' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'LLAMA' can be found hidden inside 'small amazonian'.
(Other definitions for llama that I've seen before include "South American transport system" , "A mall (anag.)" , "Camel-like wool source" , "South American animal like the camel" , "Domesticated pack animal of the Andes" .)