The most common and most likely answer to this crossword clue is the 4 letter word RICE
I've seen this crossword clue in The Times
R
I
C
E
More clues leading to the result RICE
- Grain cost reduced by a penny
- Man with energy going down gets food
- What’s charged when there’s penny off grocery item
- Infusion of turmeric enhances this?
- Clapton first to last a lyricist
- Food from recipe with something from freezer?
- Top off instant pudding
- Take dessert: it could be creamed
- Food purchaser finally gets what’s frozen
- Staple cost
Buddy explains!

The straight part
We know that "Grain" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case grain = rice.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does RICE mean?
RICE noun- Cereal plants, Oryza sativa of the grass family whose seeds are used as food.
- A specific variety of this plant.
- The seeds of this plant used as food.
- To squeeze through a ricer; to mash or make into rice-sized pieces (especially potatoes).
- To harvest wild rice (Zizania sp.)
- To throw rice at a person (usually at a wedding).
- To customize the user interface of a computer system, e.g. a desktop environment.
- (now chiefly) A twig or stick.
- A bobbin or spool.