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Wax sticks and runs until hot becomes cold (7)

Ross

I believe the answer is:

candles

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'wax sticks' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Maybe there's a link between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for candles that I've seen before include "They illuminate" , "Tealights, for example" , "Wax lights" , "They're held by sconces" , "Sticks of wax with wicks" .)

I've seen this clue in The Independent.
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