South American native that would be an idiot cutting aid (4)
I believe the answer is:
rhea
'south american native that would' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'be an idiot cutting aid' is the wordplay.
'be an idiot' becomes 'r' (I can't explain this - if you can you should give a lot more credence to this answer).
'cutting' means to remove the last letter.
'aid' becomes 'heal' (healing is a kind of aiding).
'heal' with its last letter taken off is 'hea'.
'r'+'hea'='RHEA'
Can you help me to learn more?
(Other definitions for rhea that I've seen before include "Ostrich-like bird - satellite of Saturn" , "S American runner" , "Grounded bird" , "Fast-running flightless bird" , "Large S. American bird" .)