This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 酓 is uncertain. It visually combines 今 and 酉, but the original semantic or phonetic role of these components is unclear.
The top 今 suggests 'now', and the bottom 酉 is a sake jar. Picture a mysterious jar that makes whatever you pour into it taste bitter right now, but its true purpose is unknown.
For エン, imagine an ancient jar marked with the English letter 'N' (en) that holds a bitter liquid: en -> エン, and the jar's contents are a mystery.