Egg-producing organ (5)
I believe the answer is:
ovary
'egg-producing organ' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ovary that I've seen before include "Female organ in which eggs are produced" , "Egg producing organ" , "Egg-producing gland" , "Female reproductive gland" , "Egg store" .)