This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 鬄 is uncertain. It combines 髟 (hair) with 易, but the original semantic or phonetic role of 易 in this character is unclear.
The top component 髟 suggests hair, and the bottom 易 looks like a container or change. Imagine changing a hairstyle by putting it into a container, but the exact meaning is uncertain.
For テイ, imagine a hair stylist named Tay who changes hairstyles: Tay -> テイ, and the hair component 髟 is on top.