Possible Clues:

• Sir John -, gave name to WW 2 air-raid shelter
• Bob, a world darts master
• - - shelter, prefabricated air-raid shelter
• First black England international footballer
• Actress Gillian
• Thomas A. __, birth name of Neo in the Matrix films
• Singer Marian, the first African American to perform at the Met
• Darts player Bob ____ was known as the Limestone Cowboy
• 37-Across portrayer
• "Both Your Houses" Pulitzer playwright Maxwell