Ardour (7)

I think it could be either:

passion

fervour

'ardour' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for fervour that I've seen before include "Passionate feeling" , "Passion" , "Enthusiasm - excitement" , "Heated feeling" , "Feelings of great warmth and intensity" .)

I've seen this clue in the Evening Standard.

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