Concert being performed attended by politician making a point (10)
I believe the answer is:
promontory
'a point' is the definition.
(thesaurus)
'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).
'prom'+'on'+'tory'='PROMONTORY'
'making' acts as a link.
(Other definitions for promontory that I've seen before include "Headland" , "Bluff" , "Point" , "Coastal feature" , "Bill" .)