Bird, duck, in list (7)
I believe the answer is:
rooster
'bird' is the definition.
(I know that rooster is a poultry)
'duck in list' is the wordplay.
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'in' indicates putting letters inside.
'list' becomes 'roster' (a roster is a list or register).
'o' going inside 'roster' is 'ROOSTER'.
(Other definitions for rooster that I've seen before include "Morning caller" , "One crows" , "Bird that wakes up" , "one going to sleep" , "Cockerel (mainly US)" .)