Honour destiny, say (4)
I believe the answer is:
fete
'honour' is the definition.
(I've seen this before)
'destiny say' is the wordplay.
'destiny' becomes 'fate' (synonyms).
'say' shows a homophone (sound like).
'fate' is a homophone of 'FETE'.
(Other definitions for fete that I've seen before include "Village festivity" , "Lavishly entertain; charity function" , "Outdoor entertainment and sale, often for charity" , "Elaborate outdoor party" , "Outdoor entertainment or sale, may be for charity" .)