Possible Clues:

• Novel by a hack
• Book penned by drudge after revolutionary op, book having little literary quality
• Book, film, etc, produced just for the money
• Work created for a return - book penned by drudge?
• Work written up by one struggling to bring in brass at the outset
• '. . . water-colours I never should have done at all, except for the long continuance of a necessity for '— - —' s' (D. G. Rossetti, Letters)
• Let rip with boo perhaps for this hasty work
• Shoot an old hen. Not something to be proud of
• Type of book on marijuana heating unit?
• Book of little merit written to make a quick profit