Crossword Genius

For the harvest, it needs a good downpour (5)

Ross

I believe the answer is:

grain

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But I can't explain it at all! Could you help me understand?

(Other definitions for grain that I've seen before include "Small hard seed of corn etc" , "Cereal seed" , "Direction of fibres found in wood" , "eg Barley" , "Tiny amount" .)

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