Sources of organic vegetables and eggs (3)
I believe the answer is:
ova
'eggs' is the definition.
(I've seen this before)
'sources of organic vegetables and' is the wordplay.
'sources of' says to take the initial letters.
The first letters of 'organic vegetables and' is 'OVA'.
(Other definitions for ova that I've seen before include "Female gametes" , "Multiple Latin eggs" , "Female egg-cells" , "Fertility clinic stock!" , "Latin egg-cells" .)