What does the cryptic crossword clue "Brother unable to speak regarding weapon (7)" mean?

The definition is "weapon". The wordplay uses a charade (building blocks). HARPO (synonym="Brother") + ON (synonym="regarding") = HARPOON; definition: "weapon" The answer is Harpoon.

Brother unable to speak regarding weapon (7)

Telegraph Prize Cryptic #3108 | 4 Down | 2021-05-16 flower

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