Name for many a theater (6)
I believe the answer is:
lyceum
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">name for many a theater</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lyceum that I've seen before include "School of thought" , "Lecture-hall" , "Ancient Greek school" , "hall" , "Aristotle's garden" .)