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
Manas	-	Bengali, Indian, Assamese, Hindi
Tonya	TAHN-yə	English
Pancratius	-	Ancient Greek (Latinized)
Rhydderch	HRUDH-erkh	Welsh
Gladwyn	GLAD-win	English (Rare)
Heleena	HE-le:-nah	Finnish