Crossword Genius

Of heat (7)

Ross

I believe the answer is:

thermal

'of heat' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for thermal that I've seen before include "Upward current of warm air" , "Warm or hot, say air or spring" , "which can take a glider up" , "type of baths" , "Column of rising air used by gliders" .)

I've seen this clue in the Penny Press and The Sunday Times.
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