Cleaner, without foundation, gets so upset causing utter confusion (5)
I believe the answer is:
chaos
'utter confusion' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for chaos that I've seen before include "upheaval" , "State of extreme confusion and disorder" , "Utter confusion" , "disarray" , "mess" .)