This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
艧 combines 舟 (boat) with 蒦, which likely contributes the sound ワク. The exact historical development is uncertain.
A boat 舟 with a complex right side 蒦. Since the meaning is uncertain, picture a mysterious old boat whose purpose is unknown.
For ワク, imagine a boat that is a 'wacky' invention: wacky -> ワク, and the strange boat 艧 looks like a wacky contraption.