Improvising (2-7)
I believe the answer is:
ad-libbing
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">improvising</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 ad-libbing that I've seen before include "Speaking without preparation" , "Improvising" .)