Simple light source (6)

I believe the answer is:

candle

(Other definitions for candle that I've seen before include "Lanced in light" , "A taper" , "Old form of illumination" , "Symbol of hope" , "that's wicked!" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.