This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鐱 is a phono-semantic compound: 金 (metal) suggests a metal object, while 僉 likely provides the sound. The exact historical development is uncertain.
With 金 (metal) on the left and 僉 on the right, 鐱 looks like a metal tool or weapon, but its exact meaning is unclear. Picture an ancient, mysterious metal artifact whose purpose is lost to time.
For セン, imagine a sen (銭, old coin) made of the metal 金 in 鐱: sen -> セン, tying the metal component to the reading.