Crossword puzzle clue "cause of an s r o sign"

New 13th zodiac sign that would cause all these changes (if astrologers took it seriously)

Sign that may cause U-turns

Cause of an S.R.O. sign

Good sign or bad sign

Warning sign at a train station's food court? (NOTE: The original sign, without my additions, actually exists. It's in Grand Central Terminal in NYC, on the lower level — the food court level. The sig

Sign of danger — sign of socialism

Pre-sign sign

Cause to feel shame