Eggs, but not quite oval (3)
I believe the answer is:
ova
'eggs' is the definition.
(term for egg cells)
'not quite oval' is the wordplay.
'not quite' means to remove the last letter (most but not all of the word).
'oval' with its last letter taken away is 'OVA'.
'but' is the link.
(Other definitions for ova that I've seen before include "Prerequisite for procreation" , "targets for male seed?" , "Fertility clinic stock!" , "Female reproductive cells" , "Latin egg-cells" .)