Church carols regularly creating confusion (5)
I believe the answer is:
chaos
'confusion' is the definition.
(I know that chaos is a type of confusion)
'church carols regularly' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'carols' are 'aos'.
'ch'+'aos'='CHAOS'
'creating' acts as a link.
(Other definitions for chaos that I've seen before include "confused state" , "upheaval" , "Total disorder and confusion" , "A total shambles" , "[MAYHEM]" .)