This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 簎 is uncertain. It visually combines 竹 (bamboo) with 措, but the original semantic and phonetic roles are unclear.
Since the meaning is unclear, focus on the shape: bamboo 竹 over 措, like a bamboo tool placed somewhere.
For サク, imagine a bamboo fence (saku, 柵) made from the bamboo 竹 on top: saku -> サク, even though the meaning is uncertain.
fish spear; leister; lance; trident