Politician attending debauched event with fellow countryman (10)
I believe the answer is:
compatriot
'fellow countryman' is the definition.
(I've seen this in another clue)
'politician attending debauched event' is the wordplay.
I cannot quite understand how this works, but
'politician' could be 'mp' (Member of Parliament) and 'mp' is located in the answer.
'attending' could be 'at' (e.g. at school means attending school) and 'at' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'with' acts as a link.
Can you help me to learn more?
(Another definition for compatriot that I've seen is " Fellow citizen".)