This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
澵 is a rare character combining 氵 (water) with 新, likely as a phono-semantic compound where 新 provides the sound and water suggests a river or water-related meaning. The exact historical development is uncertain.
The water radical 氵 beside 新 (new) suggests fresh, new water, but the actual meaning is unclear.
For シン, imagine a new (新) stream of water (氵) shining (シン) in the sunlight: shin -> シン.