Zeal (6)

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ardour

fervor

'zeal' is the definition.
(synonyms)

This is all the clue.

(Other definitions for ardour that I've seen before include "Passionate zeal" , "Love, passion" , "Passion, rapture" , "Great enthusiasm or passion" , "Warm, passionate feeling" .)

I've seen this clue in The Wall Street Journal, The Irish Independent, the Universal, the Evening Standard and The Independent.

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