This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 簱 is uncertain. It visually contains 竹 on top and a lower structure resembling 其, but the origin is unclear.
The top is bamboo 竹, and the lower part looks like a flag or banner. Picture a bamboo pole with a flag attached, but remember the meaning is uncertain.
For キ, imagine a key tied to the bamboo flagpole: key -> キ, and the flag waves in the wind.