Arrive, encountering uproar about a performer (8)
I believe the answer is:
comedian
'performer' is the definition.
(I know that comedian is a type of actor)
'arrive encountering uproar about a' is the wordplay.
'arrive' becomes 'come' (synonyms).
'encountering uproar about' becomes 'di' (I can't explain this - if you can you should believe this answer much more).
'a' becomes 'an'.
'come'+'di'+'an'='COMEDIAN'
(Other definitions for comedian that I've seen before include "Cracker?" , "Demoniac kind of funny man" , "scream?" , "Stand-up" , "Professional teller of jokes" .)