Crossword Genius

Sound of stinging fly (4)

Ross

I believe the answer is:

soar

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

'fly' is the definition.
(I know this)

'sound of stinging' is the wordplay.
I cannot really understand how this works, but
'of' could be 'o' and 'o' is located in the answer.
The remaining letters 'sar' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for soar that I've seen before include "Rise quickly" , "Move quickly upward" , "go high" , "Rise; sounds like painful" , "Fly high into the air" .)

I've seen this clue in the Sydney Morning Herald.
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