The use of exaggeration for effect (9)
I believe the answer is:
hyperbole
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">the use of exaggeration for effect</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for hyperbole that I've seen before include "Deliberately extravagant exaggeration" , "Exaggerated language, not meant literally" , "Exaggerated talk from boy helper" , "The use of exaggeration for effect" , "not to be taken literally" .)