This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 攱 is uncertain. It visually combines 立 and 支, but the original component relationship is unclear.
With 立 (stand) and 支 (support), imagine something standing with support, like a prop or a stand, but the actual meaning is unclear.
For キ, picture a key (キー) propping up a standing object: key -> キ, and the shape suggests standing with support.