Served up duck in swanky hotel enchanting diners initially (6)
I believe the answer is:
dished
'served up' is the definition.
('dish' can be a synonym of 'serve up')
'duck in swanky hotel enchanting diners initially' is the wordplay.
'initially' indicates taking the first letters.
The first letters of 'duck in swanky hotel enchanting diners' is 'DISHED'.
(Other definitions for dished that I've seen before include "Spoilt" , "Made slightly concave" .)