Recording some initial waste (7)

I believe the answer is:

filings

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'initial waste' is the definition.
'filings' can be an answer for 'waste' (thesaurus). I am unsure of the 'initial' bit.

'recording some' is the wordplay.
'recording' becomes 'filing' (filing is a kind of recording).
'some' becomes 's' (this could be a standard abbreviation of which I'm unaware).
'filing'+'s'='FILINGS'

Can you help me to learn more?

(Another definition for filings that I've seen is " Iron particles".)

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

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