chaff, rice hulls, (kokuji)
糘 centers on the dry, discarded outer husks of rice grains: chaff or rice hulls. It is a kokuji created in Japan to express this specific agricultural byproduct.
糘 is a Japanese kokuji formed by combining 米 (rice) and 家 (house), likely suggesting rice husks that accumulate around a household or farmstead.
Rice 米 from the house 家 leaves behind dry, papery hulls. Picture sweeping up piles of chaff outside a farmhouse.
For すくも, imagine scooping up rice hulls and muttering 'scoop more' as you work: 'scoop more' -> すくも, tying the sound to the act of gathering chaff.
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