This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
醎 is a rare character combining 酉 (wine vessel) and 咸 (a phonetic component). The exact historical development is uncertain.
The left side 酉 suggests a wine jar, and the right side 咸 looks like a halberd. Imagine a jar of salty brine used to preserve food, but the meaning is uncertain.
For カン, picture a can of salty brine: can -> カン, and the jar 酉 holds the salty liquid.