Crossword Genius

Nobody making two high-pitched sounds (9)

Ross

I believe the answer is:

pipsqueak

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'nobody' is the definition.
(pipsqueak is a kind of nobody)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for pipsqueak that I've seen before include "Contemptible person" , "Whippersnapper" , "Insignificant person" , "Dwarf" , "Tiny person, worthy of contempt" .)

I've seen this clue in The Times.
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