City teenager took part in wild revelry (6)
I believe the answer is:
rioted
'took part in wild revelry' is the definition.
The answer and definition can be both to do with social activities as well as being past participle verbs.
Perhaps you can see an association between them that I can't see?
'city teenager' is the wordplay.
'city' becomes 'Rio' (Rio de Janeiro).
'teenager' becomes 'ted' (I am not sure about this - if you are sure you should believe this answer much more).
'rio'+'ted'='RIOTED'
Can you help me to learn more?
(Other definitions for rioted that I've seen before include "Took part in violent civil disorder" , "Rampaged" , "Revolted" , "went on rampage" , "Of crowd, ran amok" .)