Possible Clues:

• Like characters lined up ready for a run-off?
• Compose in print
• Ready to be put to bed
• Kind prepared is ready for printing
• Oriental heard Pete's prepared and arranged it ready for printing
• What compositors do
• Sort prepared to be put into print
• Classes for what a compositor will do
• Uses the keyboard before an alien laid out the letters
• The sort destined to work as a compositor