Eggs are said to be done (3)
I believe the answer is:
ova
'eggs' is the definition.
(term for egg cells)
'said to be done' is the wordplay.
'said' indicates a 'sounds like' (homophone) clue.
'to be done' becomes 'over' (I've seen this in another clue).
'over' is a homophone of 'OVA'.
'are' is the link.
(Other definitions for ova that I've seen before include "Likely end for Russian Fed cup players" , "Female egg cells" , "Multiple Latin eggs" , "Female reproductive cells" , "Female gametes" .)