Quiet lines formed in front of church (7)
I believe the answer is:
silence
'quiet' is the definition.
(I know that quiet can be written as silence)
'lines formed in front of church' is the wordplay.
'formed' indicates an anagram.
'in front of' means one lot of letters go next to another.
'church' becomes 'CE' (abbreviation for Church of England).
'lines' with letters rearranged gives 'silen'.
'silen'+'ce'='SILENCE'
(Other definitions for silence that I've seen before include "It is said to be golden" , "Nothing said" , "There's nothing heard" , "Secrecy; stillness" , "Period of peace" .)