Crossword Genius

Child power makes itself heard (4)

Ross

I believe the answer is:

mite

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'child' is the definition.
(mite can informally mean a small child)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for mite that I've seen before include "The Biblical widow's offering" , "Little chap" , "Minute creature" , "Minute arachnid" , "The widow's contribution, just in time" .)

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