This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 衘 is uncertain. It visually contains the enclosure 行, but the origin of the inner component is unclear.
The outer shape 行 suggests movement or going, but the inner part is obscure. Without a clear meaning, picture a mysterious path leading to an unknown destination.
For カン, imagine a can lying on the path inside the 行 enclosure: can -> カン, and the mysterious path leads to the can.