Crossword Genius

A burning issue that's illuminating (4)

Ross

I believe the answer is:

wick

I'm a little stuck... Click here to teach me more about this clue!

'a burning issue' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for wick that I've seen before include "fishing port" , "Candle cord - Scottish town" , "Beginners" , "Candle fibre" , "Highland burgh" .)

I've seen this clue in The Globe and Mail.
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