Church article thus reversing confusion (5)
I believe the answer is:
chaos
'confusion' is the definition.
(chaos is a kind of confusion)
'church article thus reversing' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'article' becomes 'a' (the indefinite article in English).
'thus' becomes 'so' (synonyms).
'reversing' shows that the letters should be reversed in order.
'so' backwards is 'os'.
'ch'+'a'+'os'='CHAOS'
(Other definitions for chaos that I've seen before include "mess" , "upheaval" , "disarray" , "Totally disordered state" , "Total disorder and confusion" .)