Clean silver lid removed, prone to squeak (7)

I believe the answer is:

unoiled

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'clean' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I can't see?

I can't explain the rest of the clue.

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(Other definitions for unoiled that I've seen before include "Not lubricated" , "Squeaky" .)

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

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