This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
稸 combines 禾 (grain) with 畜, which likely contributes the sound. The exact historical development is uncertain.
The left side is grain 禾 and the right side is 畜, which relates to livestock or storing. Picture storing grain in a barn, but the exact meaning is uncertain.
For キク, imagine a key (キ) and a cook (ク) storing grain together: key-cook -> キク, but the meaning is unclear.