Backstage area (9)
(Other definitions for greenroom that I've seen before include "where there's relaxed entertainment" , "Backstage resting place for actors" , "Kind of lounge in theatre for off-stage actors" , "Place for actors to relax with their friends" , "Colourful rest area in theatre for actors" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">backstage area</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for green room that I've seen before include "Where actors can relax in the theatre" , "Place for actors to relax" , "Part of theatre" , "theatre? Only a bit of it" , "Here's the rest of the cast" .)