A seed head you can eat (6)
I believe the answer is:
peanut
'you can eat' is the definition.
I can't judge whether this defines the answer.
'a seed head' is the wordplay.
'a seed' becomes 'pea' (I've seen this before).
'head' becomes 'nut' (informal term for somebody's head).
'pea'+'nut'='PEANUT'
Can you help me to learn more?
(Other definitions for peanut that I've seen before include "little bit of food" , "Item of fruit" , "Tasty edible seed, often salted" , "Common snack" , "Seed also known as a goober" .)