Crossword Genius

Not so anxious since replacement's arrived? (8)

Ross

I believe the answer is:

relieved

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'arrived?' is the definition.
The answer and definition can be both to do with social activities as well as being past participle verbs.
Maybe they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for relieved that I've seen before include "siege is broken?" , "'Alleviated, lightened (8)'" , "Grateful" , "Freed by a substitute? - that relaxed the tension" , "Not so anxious - replacement has arrived" .)

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