Game birds (5,3,6)
I believe this clue is a double definition.
'game' is the first definition.
(ducks and drakes is a kind of game)
'birds' is the second definition.
(I've seen this before)
(Other definitions for ducks and drakes that I've seen before include "Mates" , "birds of both sexes" , "22 game" , "game, superficially bouncy" .)
'game birds' is the definition.
(pheasant is a kind of game bird)
This is the entire clue.
(Other definitions for pheasants that I've seen before include "Birds at Athens spa" , "Game birds with brightly coloured males" .)