Crossword Genius

In conflict, Macbeth loses heart and enthusiasm (6)

Ross

I believe the answer is:

warmth

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'enthusiasm' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for warmth that I've seen before include "Possibly fire" , "Intensity of emotion" , "tenderness" , "Cordiality" , "Pleasant heat" .)

I've seen this clue in the Sydney Morning Herald.
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