Possible Clues:

• This clue number's square root
• 'S, even one less (5)'
• The GI ate this, by the sound of one of 23 down
• Number correct after initial change
• Black billiards ball's number
• See 12
• Oarsmen scoffed, reportedly
• Grip oddly adopted by the climbing crew
• Start of prime time, generally
• Soldier seen in the overturned boat