Great passion (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">great passion</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ardour that I've seen before include "Love and enthusiasm" , "Warm, passionate feeling" , "Passion, rapture" , "Great fire" , "Passion and intensity" .)
(Another definition for ardor that I've seen is " US enthusiasm".)