Related Clues:

• With 17-Across, NASA concern
• Uncredited actor
• More than enough
• On the summit
• ''Runs like ---'' (sales pitch for a used car)
• Resting upon
• Cry repeated before 'Read all about it!'
• O
• At the apex
• Perched upon
• At the summit
• Like a third hand
• Partner of above
• Further
• On top