Beginning dressing for the audience (6)
I believe the answer is:
source
'beginning' is the definition.
(source is a kind of beginning)
'dressing for the audience' is the wordplay.
'dressing' becomes 'sauce' (I've seen this before).
'for the audience' shows a homophone (sound like).
'sauce' sounds like 'SOURCE'.
(Other definitions for source that I've seen before include "Place or person where something begins" , "Beginning to add" , "Find" , "Where something originates" , "Origin as of a river" .)