Peculiar dialect used in a Salvation Army meeting hall (7)
I believe the answer is:
citadel
'in a salvation army meeting hall' is the definition.
I can't tell whether this definition defines the answer.
'peculiar dialect' is the wordplay.
'peculiar' is an anagram indicator (I've seen this in other clues).
'dialect' anagrammed gives 'CITADEL'.
'used' acts as a link.
(Other definitions for citadel that I've seen before include "Highly-secure building" , "Stronghold into which people could go for shelter during a battle" , "Keep - castle" , "Stronghold usually within the walls" , "Fortress overlooking a city" .)