Possible Clues:

• Sheltered, in these times, in outhouse
• How Father turned up in the outhouse, not in the sun
• Under a parasol, e.g.
• Screened from direct light
• 'To be out of the sun, Dad has turned up in the outhouse (6)'
• Under the elm
• Under a large tree on a sunny day, say
• Like the area under an awning
• Treelined
• In comparative darkness