Wildfowl regularly an object of worship (4)
I believe the answer is:
idol
'an object of worship' is the definition.
(I've seen this in another clue)
'wildfowl regularly' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternate letters of 'wildfowl' are 'IDOL'.
(Other definitions for idol that I've seen before include "Pop - - (TV)" , "Worshipped figure (not painting); revered person" , "One much admired" , "Favourite" , "A graven image or object of adoration" .)