Toolbar heading (4)
I believe the answer is:
edit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">toolbar heading</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 edit that I've seen before include "Make textual changes" , "Be in charge of (newspaper)" , "Alter text" , "Check text for publication" , "work on newspaper?" .)