This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
晹 combines 日 (sun) with 易, but the exact historical development is uncertain. It may have originally related to the sun appearing or shining through, but this is speculative.
The sun 日 beside 易 suggests something about sunlight or change, but without a clear meaning, picture the sun changing shape as clouds pass.
For エキ, imagine a mysterious liquid (液, エキ) that changes color in the sunlight: エキ -> エキ, and the sun 日 watches it change.