Utter confusion when Charles admits love (5)
I believe the answer is:
chaos
'utter confusion' is the definition.
(I've seen this before)
'charles admits love' is the wordplay.
'charles' becomes 'chas' (shortened form).
'admits' means one lot of letters goes inside another.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'chas' placed around 'o' is 'CHAOS'.
'when' acts as a link.
(Other definitions for chaos that I've seen before include "Total disorder and confusion" , "Anarchy" , "mess" , "A total shambles" , "State of extreme confusion and disorder" .)