Crossword Genius

Sounds of wonder/sounds of slime (4)

Ross

I believe the answer is:

oohs

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'sounds of wondersounds' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'of slime' is the wordplay.
'of' becomes 'o''.
'slime' becomes 'ohs' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'o'+'ohs'='OOHS'

Can you help me to learn more?

(Other definitions for oohs that I've seen before include "With aahs, they're expressions of delight" , "Exclamations of surprise, shoo away" .)

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