Cryptic crossword clue
Stag party member has never thrown up inside backstage area 9

The most common and most likely answer to this crossword clue is the 9 letter word GREENROOM

I've seen this crossword clue in Independent
G
R
E
E
N
R
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O
M

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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does GREENROOM mean?

GREENROOM noun
  1. In a television studio, theatre or concert hall, the room where performers await their entrance.
  2. The inside of a tube (i.e. of a wave making a tube).

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