Possible Clues:

• Give this not to break your only weapon (3'1,4)
• See 29 Across
• 'Never break a single weapon (4,4)'
• Once given never break such a single weapon (3'1, 4)
• Given that a single weapon shows some promise
• Which rod? Do I have to spell it out?
• Promise to have given it with a single weapon
• You'd swear you'd give your single weapon
• Once given not to be broken for a weapon
• How your weapon may be given with faith