Do the commentary (7)
I believe the answer is:
narrate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">do the commentary</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 narrate that I've seen before include "Provide commentary" , "'Recount, tell (7)'" , "recount events" , "Rare ant (anag.)" , "Set forth" .)