Celebrated the antelopes' return (4)
I believe the answer is:
sung
'celebrated' is the definition.
(as opposed to 'unsung')
'the antelopes' return' is the wordplay.
'the antelopes'' becomes 'gnus' (gnu is a kind of antelope).
'return' says the letters should be written backwards.
'gnus' written backwards gives 'SUNG'.
(Other definitions for sung that I've seen before include "Performed vocally; Chinese dynasty" , "Chinese dynasty; uttered melodiously" , "Celebrated dynasty" .)