Dishes some let scourers clean (7)

I believe the answer is:

omelets

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'dishes' is the definition.
(omelet is a kind of dish)

'some let scourers clean' is the wordplay.
'some let' anagrams to 'OMELETS'.
Though, I'm not clear how this is indicated.

Can you help me to learn more?

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

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