Related Clues:

• Have in one's head
• See 97 Across
• Be aware of
• Have mastered
• Be familiar with
• Be cognizant of
• Be certain about
• ___-Nothingism
• Be confident of
• Have more than a hunch
• Not just think
• Be certain of
• Have down
• Be in on
• "Well, what do you ___?"