This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 籒 is uncertain. It visually combines 竹, 扌, and 畱, but the original semantic and phonetic roles of these components are unclear.
Since the meaning is unclear, focus on the shape: bamboo 竹 above a hand 扌 beside the complex 畱. Imagine an ancient scribe holding a bamboo stylus to write a mysterious character.
For チュウ, picture a bamboo tube (チュウブ, tube) held by the hand: tube -> チュウ, and the bamboo top reinforces the image.