Picked up source from sounds of corvine birds (4)

I believe the answer is:

caws

I'm a little stuck... Click here to teach me more about this clue!

'sounds of corvine birds' is the definition.
'caws' can be an answer for 'sounds' (caw is a kind of sound). I am unsure of the 'of corvine birds' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for caws that I've seen before include "Cries of murder" , "Rook calls" , "Harsh cries of crows" .)

I've seen this clue in The Hindu.

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