It sounds like destiny to have a gala (4)
I believe the answer is:
fete
'a gala' is the definition.
(both can mean a festive event)
'it sounds like destiny' is the wordplay.
'it sounds like' indicates a 'sounds like' (homophone) clue.
'destiny' becomes 'fate' (synonyms).
'fate' is a homophone of 'FETE'.
'to have' is the link.
(Other definitions for fete that I've seen before include "Village festival" , "Lavishly entertain; charity function" , "Outdoor gala" , "(Honour with) festivities" , "Outdoor fundraiser" .)