fortunate discovery (11)
I believe the answer is:
serendipity
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fortunate discovery</span>' is the definition.<br/ >'<span class="explanation-format__answer">serendipity</span>' can be an answer for '<span class="explanation-format__original">discovery</span>' <span class="explanation-format__explanation">(thesaurus)</span>. I also know that 'fortunate' relates to this answer.<br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for serendipity that I've seen before include "Faculty of making beneficial discoveries by accident" , "Fortunate happenstance" , "Beneficial happenstance" , "Fortunate chance" , "The accidental discovery of good fortune" .)