Game bird pig trader shot (9)
I believe the answer is:
Here is my best explanation:
'game bird' is the definition.
(partridge is a kind of game bird)
'pig trader shot' is the wordplay.
'shot' indicates anagramming the letters.
'pigtrader' with letters rearranged gives 'PARTRIDGE'.
(Other definitions for partridge that I've seen before include "Widespread bird", "1st", "early Christmas present", "Flighty type", "Bird", "Peculiarly apt girder for the game bird", "Animal", "sort of quail", "Game bird (in a pear tree?)" and "Flier".)