Possible Clues:

• Dutiful retainer following old boy
• Old bishop with attendant following religious practices
• Good at noticing
• Attentive old boy, the butler?
• (Of music)using conventional keys
• Watchful Boers playing leading part over time
• Alert old retainer saving bachelor
• Alert old maid, possibly as bee-keeper
• Guardian's sister's trait, keeping alert
• Sharp-eyed old maid, say, entertaining bishop