Cereal harvested from very early times (3)
I believe the answer is:
rye
'cereal' is the definition.
(I know that rye is a type of cereal)
'from very early times' is the wordplay.
'from' indicates the answer is hidden within the clue.
'RYE' can be found hidden inside 'very early times'.
'harvested' is the link.
This may not be correct. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for rye that I've seen before include "Grass related to wheat" , "Cereal grain" , "Grass; whisky" , "Grain - whiskey - port" , "Wheat-like cereal plant" .)