Possible Clues:

• Lunatic called into action
• Crazy leader of dissidents exploded grenade
• Psychotic called to visit 27
• Called during act -- that's insane
• Unbalanced
• Crazy greed and worry
• In document, called mad
• Unhinged
• Ditheringly dredge — and mostly in the wrong place
• You'd be without 28 down if you pressed the bell like this, indeed