This is in every way sacred for audience (6)
I believe the answer is:
wholly
'this is in every way' is the definition.
'sacred for audience' is the wordplay.
'sacred' becomes 'holy' (similar in meaning).
'for audience' shows a homophone (sound like).
'holy' sounds like 'WHOLLY'.
(Other definitions for wholly that I've seen before include "Without exception" , "in every respect" , "in full?" , "in every area" , "Totally" .)