Answers are all connected with reading, writing, books etc.
EG. Wages for each reverse PAPERBACK
4) Split with cold hesitation
5 Must you try harder for starters
11) Ordinary people story
13) Either digit beside zero number diagram charge
15) Estimation of costs
13. Any other ideas on this? I see where you're getting biography from, pixie, but where do "either" and "charge" come in? I originally thought the word might end in "ion". (a charge.)