This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
厈 combines 厂 (cliff) and 干 (shield or dry). The exact historical development is uncertain, and it is a rare character with no clear established etymology.
A cliff 厂 with a shield 干 underneath: perhaps a dry shelter under a cliff, but its meaning is unclear.
For カン, imagine a can (カン) sitting under a cliff 厂, with a shield 干 leaning against it. The can cues カン.