a bright spark

(British & Australian)

an intelligent person

Usage notes: This phrase is often used humorously to mean the opposite.

Some bright spark was clearing up and threw my invitation away.

Name	Pronounced	Usage
Bairre	-	Irish
Candace	['kændə.si]
Corey	KAWR-ee	English
Wilhelm	VIL-helm (German), VEEL-khelm (Polish)	German, Polish, Ancient Germanic
Jagannath	-	Indian, Hindi
Luanna	loo-AN-ə	English (Rare)