Poultry found initially by bird of prey (4)
I believe the answer is:
fowl
'poultry' is the definition.
(I know that poultry can be written as fowl)
'found initially by bird of prey' is the wordplay.
'initially' says to take the initial letters.
'by' is a charade indicator (letters next to each other).
'bird of prey' becomes 'owl' (owl is a kind of bird of prey).
The initial letter of 'found' is 'f'.
'f'+'owl'='FOWL'
(Other definitions for fowl that I've seen before include "Cock or hen" , "Bird kept for eggs and meat" , "Any farmyard bird" , "Poultry bird" , "Domestic birds" .)