Church leading an expression of pleasure or displeasure (7)
I believe the answer is:
chagrin
'displeasure' is the definition.
(thesaurus)
'church leading an expression of pleasure' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'leading' indicates taking the first letters (the leading letter of the word).
'expression of pleasure' becomes 'grin' (I've seen this before).
The first letter of 'an' is 'a'.
'ch'+'a'+'grin'='CHAGRIN'
'or' acts as a link.
(Other definitions for chagrin that I've seen before include "Annoy" , "Feeling of vexation or embarrassment" , "Annoyance at having been humiliated" , "Humiliation, mortification" , "anything but delight" .)