Doing word (4)
I believe the answer is:
verb
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">doing word</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 verb that I've seen before include "A word that conveys action" , "Word that denotes an action or a state" , "Type of word indicating action" , "'In grammar, it denotes action (4)'" , "Part of speech" .)