Boys' Brigade penning song of praise, including most of lad's slogan (3,3,4)
I believe the answer is:
ban the bomb
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for ban the bomb that I've seen before include "disarming message" , "pacifist's slogan" .)
I've seen this clue in The Times.
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