Anecdotal knowledge (4)
I believe the answer is:
lore
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">anecdotal knowledge</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 lore that I've seen before include "Tales of old" , "Old learning" , "Ancient learning" , "Traditional belief" , "old-fashioned thong" .)