This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
稕 combines 禾 (grain) with 享, which likely contributes sound. The exact historical development is uncertain.
The left side is grain 禾, and the right side is 享. Without a clear meaning, picture a bundle of grain stalks tied together, as the kun reading わらたば suggests a straw bundle.
For シュン, imagine a bundle of grain shoots soon after harvest: shoots soon -> シュン, and the grain is gathered.