Concert being performed attended by politician making a point (10)
I believe the answer is:
Here is my best explanation:
'a point' is the definition.
'concert being performed attended by politician' is the wordplay.
'concert' becomes 'prom' (abbreviation for promenade concert).
'being performed' becomes 'on' (I've seen this in other clues).
'attended by' means one lot of letters go next to another.
'politician' becomes 'tory' (I've seen this before).
'making' acts as a link.