Related Clues:

• Fully up-to-date
• Not out of it
• Sound in the head
• Lucid
• Clued in
• Posted, so to speak
• Has enough marbles
• Right-minded
• Tuned in to
• Playing will a full deck, so to speak
• Well-apprised
• Capable of thinking clearly
• Not out of one's mind
• Up on the latest
• Knowing