Related Clues:

• Popular act, certainly
• 'This ___' (1979 hit)
• "This ___" (1979 hit)
• Words starting many a guess
• 'Oh yeah?'
• "Ya think?"
• Home needs action, certainly
• Certainly favoured taking action
• '___ just me ...'
• "Honest?"
• "___ just me, or . . ."
• It's in action, certainly
• "__ just me?"
• With 18-Across, question you should never ask about crosswords, because the answer is obviously 'Obviously!!!'
• 'You really think so?'