Oriole regularly produces eggs (3)
I believe the answer is:
roe
'eggs' is the definition.
(I've seen this before)
'oriole regularly' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'oriole' are 'ROE'.
'produces' is the link.
(Other definitions for roe that I've seen before include "Lobster's ripe ovary" , "Food from fish" , "shy animal" , "Fish eggs; small deer" , "Mass of fish's eggs" .)