Where the action happens (3)
I believe the answer is:
set
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">where the action happens</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 set that I've seen before include "decline" , "Fixed; collection" , "Major segment of tennis match" , "Put, coagulate" , "Determined or congealed" .)