Fruit and grain mostly in a container (7)
I believe the answer is:
apricot
'fruit' is the definition.
(apricot is a kind of fruit)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for apricot that I've seen before include "A fruit-tree" , "tree" , "Asian fruit" , "Small, peach-like fruit" , "Orange fruit" .)