Crossword Genius

So many captured sounds! (5)

Ross

I believe the answer is:

thuds

'sounds' is the definition.
(thudding is a kind of sounding)

'so many captured' is the wordplay.
'so' becomes 'thus' (synonyms).
'many' becomes 'D' (Roman numeral for 500).
'captured' is an insertion indicator.
'thus' going around 'd' is 'THUDS'.

I've seen this clue in The Daily Express.
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