Related Clues:

• Not one card short of a deck
• Having both oars in the water
• Mentally competent
• Mentally balanced
• Turns up, two coppers left sober
• Balanced mentally
• Compos mentis
• Sound of mind
• Not obsessed with One Direction, say
• Easily comprehended
• Clearly worded
• Court psychologist's ruling
• Not without reason, only partly believes an expert or trusts a nerd
• Psychiatrist's determination, maybe
• Moderate in thought