This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 扺 is uncertain. It visually combines 扌 (hand) and 氏, but the original semantic and phonetic roles are unclear.
With no clear meaning, focus on the shape: a hand 扌 beside 氏, like a hand touching a clan symbol. The meaning remains uncertain.
For シ, imagine a hand 扌 pointing at the 氏 symbol and saying 'she' (シ) as if naming it. The sound 'she' cues シ.