This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 攼 is uncertain. It visually combines 干 and 攵, but the original function and component relationship are unclear.
The left side 干 suggests a shield or to dry, and the right side 攵 suggests an action. Imagine someone striking a shield to demand something, but the meaning is uncertain.
For カン, picture a can being struck by the action hand 攵: can -> カン, and the hand hits the can.