Study of word origins (9)
I believe the answer is:
etymology
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">study of word origins</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 etymology that I've seen before include "Investigation of derivation of words" , "Word history" , "Study of the derivation of words" , "Study of origin of words" , "original source" .)