Possible Clues:

• One who may sign a book
• One who calls round for it in a flap
• Five, is it? Or is that the one that's calling?
• One might call for face protection over it
• Inspector Salteena, for one, having a better spell
• One may have come to stay
• It will stay in what's over the face
• After six, take a chair or go by and by (7)
• One calls for victory - is it over outside?
• One calling for it in sun block