This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
珝 combines 王 (jade) and 羽 (feathers). The exact historical development is uncertain, but it likely relates to a type of jade ornament or a name.
The left side 王 suggests jade, and the right side 羽 suggests feathers. Picture a delicate jade ornament carved in the shape of a feather.
For ク, imagine a cool jade feather: cool -> ク, and the feather-shaped jade feels cool to the touch.