This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 敟 is uncertain. It visually combines 典 and 攵, but the original component relationship is unclear.
The left side 典 suggests a record or rule, and the right side 攵 suggests an action. Picture someone acting on a document, but the exact meaning is unclear.
For テン, imagine the number ten written on a document: ten -> テン, and the action 攵 is applied to it.