County choristers were discordant (14)
I believe the answer is:
worcestershire
'county' is the definition.
(English county)
'choristers were discordant' is the wordplay.
'discordant' indicates anagramming the letters.
'choristers'+'were'='choristerswere'
'choristerswere' anagrammed gives 'WORCESTERSHIRE'.
(Other definitions for worcestershire that I've seen before include "where triennial choir festival staged?" , "English county" , "saucy locale?" .)