This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
粷 combines 米 (rice) with 匊, which may be a phonetic component. The exact historical development is uncertain.
The left side is rice 米, and the right side 匊 looks like a wrapped handful. Imagine a handful of rice flour wrapped up, but the exact meaning is unclear.
For キク, picture a chrysanthemum (菊, キク) made of rice flour: 菊 -> キク, and the rice-flour flower helps remember the reading.