Performed? Performed, carrying pack in (9)
I believe the answer is:
acquitted
'performed?' is the definition.
The answer and definition can be both to do with social activities as well as being past participle verbs.
Maybe there's an association between them I don't understand?
'performed carrying pack in' is the wordplay.
'performed' becomes 'acted' (acting is a kind of performing).
'carrying pack' becomes 'quit' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'acted' placed around 'quit' is 'ACQUITTED'.
Can you help me to learn more?
(Other definitions for acquitted that I've seen before include "Found not guilty and discharged" , "Settled" , "Absolved" .)