Shrill South American native starts to call help, yelling (8)

I believe the answer is:

screechy

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'shrill' is the definition.
(thesaurus)

'south american native starts to call help yelling' is the wordplay.
'south american native' becomes 'scree' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'starts to' says to take the initial letters.
The first letters of 'call help yelling' is 'chy'.
'scree'+'chy'='SCREECHY'

Can you help me to learn more?

(Other definitions for screechy that I've seen before include "Shrieky" , "Loud and shrill" , "Harsh and shrill" , "Loud, harsh, piercing" , "calling loudly" .)

I've seen this clue in The Telegraph.

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