This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 睗 is uncertain. It visually combines 目 (eye) and 易, but the original semantic or phonetic role of these components is unclear.
With 目 (eye) on the left and 易 (easy/change) on the right, you might imagine an eye that changes easily, but the actual meaning is unclear.
For セキ, imagine a sudden flash of lightning (いなびかり) striking a stone (石, セキ) right before your eyes (目). The stone's reading セキ cues the on'yomi.