This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
偀 is a rare character composed of 亻 (person) and 英. The exact historical development is uncertain, but it likely follows a phono-semantic pattern where 英 contributes the sound and the person radical suggests a human-related meaning.
A person 亻 beside 英 (which can mean 'excellent' or 'flower') might suggest a person of excellence, but the true meaning is unclear.
For エイ, use the reading of the right component 英 (エイ). Picture a person 亻 holding a flower 英 and saying 'A!' (エイ) in admiration.