Eggs are declared done (3)
I believe the answer is:
ova
'eggs' is the definition.
(I've seen this before)
'declared done' is the wordplay.
'declared' shows a homophone (sound like).
'done' becomes 'over' (I've seen this before).
'over' sounds like 'OVA'.
'are' acts as a link.
(Other definitions for ova that I've seen before include "Release of women" , "targets for male seed?" , "Potential life sources" , "Multiple Latin eggs" , "Female gametes" .)