Sudden excitement (6)
I believe the answer is:
thrill
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sudden excitement</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 thrill that I've seen before include "Sudden rush of pleasure" , "Kick" , "Exhilarate, excite" , "Almost pleasant sensation of fright" , "Almost pleasurable sensation of fright" .)