When paid, stopped being restless (7)

I believe the answer is:

settled

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'when paid' is the definition.
'settled' can be an answer for 'paid' (thesaurus). I'm not sure about the 'when' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for settled that I've seen before include "Colonised; decided" , "Came down; resolved" , "Resolved (an argument)" , "Agreed; sorted" , "came to agreement" .)

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