This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
蛒 combines 虫 (insect) with 各, which likely contributes a phonetic element. The exact historical development is uncertain.
The insect radical 虫 suggests a bug, but the meaning is unclear. Imagine a mysterious insect that defies easy description.
For カク, picture a bug trapped in a cage: cage -> カク, and the insect 虫 is inside.