This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
錧 combines 金 (metal) with 官, which likely contributes the sound. The exact historical development is uncertain.
Metal 金 and an official 官 shape together suggest a metal tool or fitting, but the exact meaning is unclear.
For カン, imagine a metal can with an official seal: can -> カン, and the metal 金 and official 官 shape reinforce the image.