This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
簬 combines 竹 (bamboo) with 路, which likely contributes the sound. The exact historical development is uncertain.
The top 竹 suggests bamboo, and the bottom 路 suggests a path. Imagine a path lined with bamboo, but the kanji's meaning is uncertain.
For ロ, picture a low bamboo path: low -> ロ, and the bamboo 竹 over the path 路 helps you remember the reading.