This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鐗 combines 金 (metal) with 閒, which likely contributes the sound. The exact historical development is uncertain.
The left side is metal 金, and the right side 閒 looks like a gate 門 with a moon 月 inside. Picture a metal gate under moonlight, but its meaning remains uncertain.
For カン, imagine a metal can (カン) sitting by the moonlit gate: can -> カン, and the metal can is part of the scene.