Possible Clues:

• Observer
• See 12
• If this is more of a 16 down, look out
• One looks well for the time, perhaps
• I observe church getting flooded?
• We get a chart for one to keep an eye on it
• Onlooker caught in middle of the war, unfortunately
• He observed, or said, it's a cockney greeting
• One who observes
• See 22 Down