Luckily (11)
I believe the answer is:
fortunately
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">luckily</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for fortunately that I've seen before include "As luck would have it" , "Luckily" , "By good luck" .)