This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 叏 is uncertain. It may be an ancient variant or simplified form, but its origin is not well documented.
Since the meaning is unclear, focus on the shape: a hand 又 holding something above, but what it holds is unknown.
For カイ, imagine a mysterious key (カイ) that unlocks the meaning of this rare kanji: key -> カイ, and the hand 又 tries to turn it.