help, subordinate official, obsolete government service rank
掾 centers on a subordinate official or helper, specifically an obsolete government service rank. The core idea is a person in a supporting role within a hierarchy.
掾 combines 扌 (hand) with 彖, which likely contributes the sound and may relate to a pig or animal, but the exact historical development of the character as a whole is uncertain. The meaning of a subordinate official is not directly derivable from the visible components.
The hand radical 扌 suggests a person who assists or works under someone. The right side 彖 looks like a complex official seal or document, so imagine a subordinate official handling paperwork with their hands.
For エン, picture a subordinate official helping at the end of a long corridor: end -> エン, and the hand 扌 is always ready to assist.