Having dropped diamonds, Danny Ocean's in a state of confusion and anger (9)
I believe the answer is:
annoyance
'anger' is the definition.
(annoyance is a kind of anger)
'having dropped diamonds danny ocean's in a state' is the wordplay.
'having dropped' indicates named letters should be taken away.
'diamonds' becomes 'd' (abbreviation for the card suit diamonds).
'in a state' indicates an anagram (the letters in confusion or chaos).
'danny'+'ocean'='dannyocean'
'dannyocean' with 'd' taken away is 'annyocean'.
'annyocean' is an anagram of 'ANNOYANCE'.
'of confusion and' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for annoyance that I've seen before include "trouble" , "(Anger at) harassment" , "Source of anger" , "Feeling of slight anger" , "Irritation, vexation" .)