This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
枱 combines 木 (tree/wood) with 台, which likely contributes a phonetic element. The exact historical development is uncertain, and the character is rare in modern Japanese.
A tree 木 beside a platform 台 suggests a wooden stand or table, but the actual meaning is uncertain.
For イ, imagine an easel (イーゼル) made of wood 木 standing on a platform 台: easel -> イ.