Possible Clues:

• Moon starer, possibly
• One ogling heavenly bodies?
• Bliss, maybe of troubled star Monroe
• American embraces endlessly resilient old scientist
• One of those out watching the stars for The Observer who presumably won't look at The Sun?
• Scientist whose research needs looking up
• Spends a lot of time looking into space for night-watchman
• One who studies celestial bodies in the heavens
• Scientist who may have difficulty working under a cloud
• Scientist and epicure missing grand opening of restaurant