Grouse, say, willing to get porridge (4,4)
I believe the answer is:
game bird
'grouse say' is the definition.
(grouse is a kind of game bird)
'willing to get porridge' is the wordplay.
'willing' becomes 'game' (game can mean willing to do something).
'to get' says to put letters next to each other.
'porridge' becomes 'bird' (I've seen this before).
'game'+'bird'='GAME-BIRD'
(Other definitions for game bird that I've seen before include "Ambridge (anag) -- eg grouse" , "Pheasant, say?" , "Woodcock" , "Pheasant, for example" , "Grouse, perhaps" .)