Possible Clues:

• Flourishing opportunity for those off stage
• Backstage waiting spot
• Newly-wed carrying on with nurse in place behind the scenes?
• Kind of lounge in theatre for off-stage actors
• Colourful rest area in theatre for actors
• Dress circles never circling theatre? Only a bit of it
• Place for putting such a one playing 21 across
• Part of theatre is place for putting on tie upside down
• Players' sanctum gives nature-lover scope
• Backstage resting place for actors