Crossword Genius

Heard not many resettled, renouncing right to be cleansed (9)

Ross

I believe the answer is:

fumigated

I'm a little stuck... Click here to teach me more about this clue!

'heard' is the definition.
The definition and answer can be both to do with perception as well as being past participle verbs.
Maybe there's an association between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

I've seen this clue in The Times.
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