Inner part of a seed (6)
I believe the answer is:
kernel
'inner part of a seed' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for kernel that I've seen before include "The edible centre of a nut" , "Core of a nut" , "Edible seed of nut" , "Inner part of nut" , "Nucleus" .)