Related Clues:

• Playing will a full deck, so to speak
• Capable of thinking clearly
• Realistic
• Not out of one's mind
• Clear-headed
• Not nuts
• Perfectly reasonable
• Opposite of 53-Down
• Able to stand trial
• Entirely sensible
• Completely marbled?
• Fit to stand trial, say
• Not certifiable
• Not nuts or crackers
• Practical