Takes orders from US agent, returning diamonds (8)
I believe the answer is:
defrocks
'takes orders' is the definition.
The definition and answer can be both to do with social activities as well as being verbs in their -s form.
Perhaps you can see a link between them that I can't see?
'us agent returning diamonds' is the wordplay.
'us agent' becomes 'fed' (short for a federal agent).
'returning' is a reversal indicator.
'diamonds' becomes 'rocks' (I've seen this before).
'fed' in reverse letter order is 'def'.
'def'+'rocks'='DEFROCKS'
'from' acts as a link.
Can you help me to learn more?
(Another definition for defrocks that I've seen is " Deprives of ecclesiastical status".)