Wildly exaggerated, as a performance (4,3,3)
I believe the answer is:
over the top
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wildly exaggerated as a performance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for over the top that I've seen before include "How infantry used to go into action" , "Stallone film" , "Where the circus flag might be" , "Too [B?]old" , "To an exaggerated degree" .)