Virginia's on ordinary eggs (3)
I believe the answer is:
ova
'eggs' is the definition.
(term for egg cells)
'virginia's on ordinary' is the wordplay.
'virginia' becomes 'va' (US state abbreviation).
'on' is a charade indicator (letters next to each other).
'ordinary' becomes 'O' (abbreviation e.g. O-Levels).
'va' put after 'o' is 'OVA'.
(Other definitions for ova that I've seen before include "Potential life sources" , "Prerequisite for procreation" , "Latin egg-cells" , "Female gametes" , "Female egg cells" .)