Improve text (5)
I believe the answer is:
emend
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">improve text</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 emend that I've seen before include "Edit; make alterations to a draft" , "Correct; edit" , "Rectify" , "Improve by altering" , "Correct and improve the text" .)