Related Clues:

• Hot concept
• Exit-poll indication
• Hula hoops, e.g.
• Temporary craze
• Pollster’s find
• Its popularity is short-lived
• Passing interest
• Pet rocks, once
• The latest in fashion
• Hula hoop or coonskin cap
• Short-lived rage
• Prevailing tendency
• Streaking, once
• Blow up, in a way
• "In" thing, for now