Crossword Genius

It tightens a nut in a cleaning machine (6)

Ross

I believe the answer is:

washer

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This could be a double definition.

'it tightens a nut in a cleaning' is the first definition.
The definition suggests a singular noun which matches the answer.

'machine' is the second definition.
(I have seen 'Laundry machine ' mean 'washer' so perhaps 'machine' could also mean 'washer')

Can you help me to learn more?

(Other definitions for washer that I've seen before include "keep things firm" , "Ring under a nut" , "Flattened ring that keeps nuts secure" , "Cleaner" , "Tap seal" .)

I've seen this clue in The Globe and Mail.
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