This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 鉩 is uncertain. It combines 金 (metal) with 尒, but the component relationship is unclear.
With no clear meaning, focus on the shape: metal 金 beside 尒. Remember it as a rare metal-related character.
For ジョウ, imagine a metalworker named Joe shaping a rare metal piece: Joe -> ジョウ, and the metal 金 is being worked.