Possible Clues:

• The fourth item given legal status
• Possibly a daughter bound by written contract
• Like apprentices, perhaps, in short item by editor
• Like office trainees, perhaps, object over board's conclusion
• Bound as an apprentice (eg, in a legal office)
• Fourth piece of writing for this kind of clerk?
• Like some clerks
• Perhaps a daughter will be contracted for clerical work?
• - Clerk, trainee solicitor
• Item given to daughter training as solicitor