This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 竬 is uncertain. It combines 立 (stand) and 禹, but the original semantic and phonetic roles are unclear.
The left side 立 suggests standing, and the right side 禹 is a complex shape. Without a clear meaning, picture a mysterious figure standing beside an ancient symbol, its purpose unknown.
For ク, imagine a cool, quiet scene where the mysterious figure stands: cool -> ク, and the figure remains still.