This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鋎 combines 金 (metal) with 完, which likely contributes the sound. The exact historical development is uncertain, and the character is rare.
The left side is metal 金, and the right side is 完 (complete). Imagine a metal tool that is complete and ready, but its exact purpose is unknown.
For カン, picture a can made of metal (金) that is complete (完): can -> カン.