Poultry found initially by bird of prey (4)
I believe the answer is:
fowl
'poultry' is the definition.
(synonyms)
'found initially by bird of prey' is the wordplay.
'initially' says to take the initial letters.
'by' means one lot of letters go next to another.
'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" .)