This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
爴 combines 國 (country) and 爪 (claw). The exact historical development is uncertain, but it likely relates to grasping or seizing, given the claw component.
A claw 爪 reaching into a country 國, as if grasping or snatching something away.
For カク, imagine a claw snatching a cuckoo clock from a country: cuckoo -> カク, and the claw grabs it.