This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鐈 combines 金 (metal) with 喬, which likely contributes the sound. The exact historical development is uncertain.
The left side is metal 金, and the right side 喬 suggests something tall or high. Picture a tall metal pot, but remember the meaning is uncertain.
For キョウ, imagine a tall metal pot in Kyoto: Kyoto -> キョウ, and the pot is made of metal.