Rinse a songbird's stuffing that's fit to be eaten (2,6)
I believe the answer is:
in season
'fit to be eaten' is the definition.
(I've seen this before)
'rinse a songbird's stuffing' is the wordplay.
'stuffing' says the answer is hidden in the clue.
'IN SEASON' is hidden in the letters of 'rinse a songbirds'.
'that's' is the link.
(Other definitions for in season that I've seen before include "Ripe; ready for use" , "Available during Yuletide?" , "when crops are ready?" , "Fit to be eaten" , "Of food, available as freshly gathered crop" .)