Sound may indicate a child's progress (6)

I believe the answer is:

report

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'sound' is the definition.
(I know that report is a type of noise)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for report that I've seen before include "Journalist's account - explosive noise" , "Sudden noise (gunfire)" , "Announce; gunshot" , "Porter (anag.)" , "A loud bang, or an account" .)

I've seen this clue in The Globe and Mail.

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