Possible Clues:

• English poet and novelist who died in 1956
• Walter ____ , English poet, d. 1956
• Man about to join in venture as a writer
• Walter — — —, poet
• Author of The Ascent of Man blocking venture
• Author in a state, one of the characters flipping over
• Walter -- -- --, author
• A mere lad, novel poet
• Poet whose listeners knocked on the moonlit door?
• Poet of the sea, given recital in French