This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
笿 is a rare character composed of 竹 (bamboo) and 各. The exact historical development is uncertain, but it likely relates to bamboo objects or containers.
The top 竹 suggests bamboo, and the bottom 各 looks like a container. Picture a bamboo basket or woven bamboo object, though its exact meaning is unclear.
For ラク, imagine a bamboo basket that is easy to carry, like a light rack: rack -> ラク, and the bamboo basket is a rack for holding things.