This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
縀 combines 糸 (thread) with 叚, which likely contributes a sound element. The exact historical development is uncertain.
The left side is thread 糸, and the right side 叚 looks like a complex tool. Imagine a rare, mysterious thread used for an unknown purpose.
For カ, picture a car (カ) made of thread: a strange, rare vehicle woven from 糸.