Vocally celebrate destiny (4)
I believe the answer is:
fate
'destiny' is the definition.
(I know that destiny can be written as fate)
'vocally celebrate' is the wordplay.
'vocally' shows a homophone (sound like).
'celebrate' becomes 'fete' (synonyms).
'fete' is a homophone of 'FATE'.
(Other definitions for fate that I've seen before include "Final issue" , "Fortune" , "Clotho, Lachesis or Atropos" , "Inevitable destiny" , "Destiny, kismet" .)