Pip, kernel (4)
I believe the answer is:
seed
I believe this is a double definition.
'pip' is the first definition.
(I've seen this before)
'kernel' is the second definition.
(I've seen this before)
(Other definitions for seed that I've seen before include "Propagative part of plant" , "Beginning; sow (land)" , "Court favourite" , "Grain" , "Pip for sowing" .)