Possible Clues:

• *Letter-writing and map-reading, these days
• They keep watch for someone or something expected
• Initially, keep on the underground to get around Norwegian capital - they'll watch out for you.
• Crow's-nests, e.g
• Ones in crow's-nests, perhaps
• Beware second hands on watch?
• Crow's-nest occupants
• Dizzy took soul from those keeping sketch locally
• They keep watch
• Sen tries to have watches