Possible Clues:

• Line in bootees unfortunately no longer in use
• No longer used, as a word
• Discontinued outside broadcast -- one nudging bounds of taste
• Like the telegraph, nowadays
• Out-of-date old boys look back, wanting summer in Paris
• Old Boy, by himself, note, unfashionable
• Dated pupil, once only, note
• He passed on one note out of habit?
• Let oboes play like serpents?
• 24ac loos unfortunately out of use