Possible Clues:

• Climber writes off first-class returns
• Climber writes a novel about island
• I swear it is a flowering vine
• I write as a flowering vine
• Plant waiter is cultivating
• Climbing shrub
• Woody vine with violet blossoms
• Plant in which waiter is maltreated
• Is water I sprinkled bringing it in flower?
• Climber once knew river flowing from east to west