Commonly done (7)
I believe the answer is:
diddled
'commonly done' is the definition.
The definition and answer can be both to do with social activities as well as being past participle verbs.
Maybe you can see an association between them that I don't see?
'done' is the wordplay.
I cannot quite see how this works, but
'done' could be 'led' (leading is a kind of doing) and 'led' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for diddled that I've seen before include "Swindled" , "cheated" .)