Opera box (4)
I believe the answer is:
loge
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">opera box</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 loge that I've seen before include "Private box in a theatre" , "Opera-house box" .)