Possible Clues:

• ''Ghosts'' dramatist
• ''Ghosts'' writer
• Playwright with drug - ditch posh professor and put in saint
• Playmaker content in upping one's bid
• On reflection Nesbit is deficient as writer
• Norwegian playwright (Peer Gynt)
• Brand loyalty is expected of his admirers
• Dramatist's home visited by killer in Ayrshire
• Playwright making money after one book
• Children's writer almost turns playwright