Yields plant ovules, say (5)
I believe the answer is:
cedes
'yields plant' is the definition.
'cedes' can be an answer for 'yields' ('cede' can be a synonym of 'yield'). I'm not sure about the 'plant' bit.
'ovules say' is the wordplay.
'ovules' becomes 'seeds' (seed is a kind of ovule).
'say' shows a homophone (sound like).
'seeds' is a homophone of 'CEDES'.
Can you help me to learn more?
(Other definitions for cedes that I've seen before include "Gives way" , "Surrenders or yields" , "Yields, hands over" , "Surrenders or relinquishes" , "Hands over formally" .)