Fine bird, and one that provides us with eggs (4)
I believe the answer is:
fowl
'one that provides us with eggs' is the definition.
(bird kept for her eggs)
'fine bird' is the wordplay.
'fine' becomes 'f' (abbreviation).
'bird' becomes 'owl' (owl is a kind of bird).
'f'+'owl'='FOWL'
'and' is the link.
(Other definitions for fowl that I've seen before include "Bird, maybe domestic" , "eg Chicken" , "Any farmyard bird" , "Domestic birds" , "Poultry bird" .)