Possible Clues:

• Yielding with little resistance, say, when about to retire
• Responding about codebreaker concealing note
• Runner hampered with it, good on the way back
• Making a comeback, like Garnett's Targett
• Going back
• Going back over last character for Alan Turing to pen
• Going or taking back
• Call about English act making comeback
• Bringing back wartime code-breaker around November to support soldiers
• This could create slip-up from pupils coming home