ape
蝯 centers on a specific kind of ape, likely a gibbon or long-armed ape, as suggested by its Japanese kun reading てながざる (long-armed monkey). The single English meaning 'ape' captures this general category.
蝯 combines 虫 (insect/reptile/creature) with 爰, which likely contributes the sound. The character likely originally referred to a type of ape, with 虫 used broadly for animals in older Chinese classification.
The left side 虫 (creature) and the right side 爰 (which looks like a hand reaching down) together suggest a long-armed creature: an ape.
For エン, imagine an ape swinging through the trees and landing with a soft 'en' sound as it grabs a branch. The 'en' sound cues エン.