Sacred performance on the radio -- it's true (5)
I believe the answer is:
right
'true' is the definition.
(associated in meaning)
'sacred performance on the radio' is the wordplay.
'sacred performance' becomes 'rite' (a sacred ceremony or ritual).
'on the radio' indicates a 'sounds like' (homophone) clue.
'rite' is a homophone of 'RIGHT'.
'it's' acts as a link.
(Other definitions for right that I've seen before include "correctly" , "''The customer is always .....''" , "The Tory side" , "True - just claim" , "Most favourable" .)