Facial expression noble Anne changed before church (11)
I believe the answer is:
countenance
'facial expression' is the definition.
'noble anne changed before church' is the wordplay.
'noble' becomes 'count' (I've seen this before).
'changed' indicates an anagram.
'before' means one lot of letters go next to another.
'church' becomes 'ce' (abbreviation for Church of England).
'anne' anagrammed gives 'enan'.
'count'+'enan'+'ce'='COUNTENANCE'
(Other definitions for countenance that I've seen before include "features" , "Favour" , "brook" , "Tolerate - face" , "A person's face; admit as possible" .)