What does the cryptic crossword clue "Bar lock getting reinforcement (8)" mean?

The definition is "reinforcement". The wordplay uses a charade (building blocks). BUT (synonym of "Bar") + TRESS (synonym of "lock"); definition: "reinforcement" The answer is BUTTRESS.

Bar lock getting reinforcement (8)

Guardian Cryptic #29049 | 14 Across | 2023-04-20 flower

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