Fable's lesson (5)
I believe the answer is:
moral
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fable's lesson</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for moral that I've seen before include "Upright; message of fable" , "Virtuous and principled" , "Relating to principles of right and wrong" , "Underlying significance of a story or event" , "Righteous" .)