What does the cryptic crossword clue "Peculiar dialect used in a Salvation Army meeting hall (7)" mean?

The definition is "hall". The wordplay uses an anagram. anagram of DIALECT ("dialect") [anagram: "used"] = CITADEL; definition: "Salvation Army meeting hall" The answer is CITADEL.

Peculiar dialect used in a Salvation Army meeting hall (7)

Guardian Cryptic #28142 | 5 Across | 2020-05-25 flower

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Peculiar dialect used in a Salvat­ion Army meeting hall (7)

Peculiar dialect used in a Salvation Army meeting hall (7)