This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鐂 combines 金 (metal) with 畱, which likely contributes the sound. The exact historical development is uncertain.
The left side is metal 金, and the right side 畱 is a complex shape. Without a clear meaning, picture an ancient metal artifact with an unknown purpose, its shape as mysterious as the kanji itself.
For リュウ, imagine a metal dragon (竜, リュウ) coiled around the right component: 竜 -> リュウ, and the metal dragon guards the mysterious artifact.