Radical artist interrupts local story (9)
I believe the answer is:
narrative
'story' is the definition.
(synonyms)
'radical artist interrupts local' is the wordplay.
'radical' becomes 'r' (chemistry abbreviation).
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'interrupts' is an insertion indicator.
'local' becomes 'native' (relating to a particular area).
'r'+'ra'='rra'
'rra' placed into 'native' is 'NARRATIVE'.
(Other definitions for narrative that I've seen before include "Account describing events" , "Tale" , "Verbal account" , "Story recounting events" , "Spoken account; story" .)