This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 籡 is uncertain. It visually combines 竹 (bamboo) with 撿, but the original semantic and phonetic roles are unclear.
With 竹 (bamboo) on top and a complex lower part, 籡 might suggest a bamboo tool or object, but its meaning is not known. Think of it as a mysterious bamboo artifact.
For しんし, imagine a gentleman (紳士, しんし) carefully examining an unknown bamboo tool: 紳士 -> しんし, and the gentleman is puzzled by the rare 籡.
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