Related Clues:

• With 45-Down, words after 'Pssst!'
• Terminated
• Radio message ender
• On the summit
• More than
• ''Runs like ---'' (sales pitch for a used car)
• Resting upon
• Walkie-talkie user's word
• Word with throw or turn
• See 56-Across
• O
• At the apex
• All finished
• Radio-message ender
• Perched upon