Crossword Genius

Heat that could make a run grim (6)

Ross

I believe the answer is:

ardour

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

'a run grim' is the wordplay.
'a run' becomes 'ar' (I've seen this in other clues).
'grim' becomes 'dour' (synonyms).
'ar'+'dour'='ARDOUR'

'that could make' is the link.

(Other definitions for ardour that I've seen before include "Love and enthusiasm" , "Emotional warmth" , "Burning desire" , "Passion, rapture" , "Fervour, zeal" .)

I've seen this clue in The Telegraph.
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