Quiet Nile's meandering by church (7)
I believe the answer is:
silence
'quiet' is the definition.
(I know that quiet can be written as silence)
'nile's meandering by church' is the wordplay.
'meandering' indicates anagramming the letters.
'by' says to put letters next to each other.
'church' becomes 'CE' (Church of England).
'niles' is an anagram of 'silen'.
'silen'+'ce'='SILENCE'
(Other definitions for silence that I've seen before include "It is golden acccording to the 1960s song" , "Lack of sound" , "There's nothing heard" , "Absence of sound" , "No talking" .)