Crossword Genius

Relating to heat (7)

Ross

I believe the answer is:

thermal

'relating to heat' is the definition.
(I know this)

This is all the clue.

(Other definitions for thermal that I've seen before include "Warming" , "which can take a glider up" , "Her malt became heat-related" , "Warm or hot - underwear?" , "Up-current of air" .)

I've seen this clue in The Sun, The Guardian, The Daily Mail, the Sydney Morning Herald and The Mirror.
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