In confusion it is sent up in wrong coach (7)
I believe the answer is:
chaotic
'in confusion it is sent up in wrong coach' is the definition.
I can't tell whether this definition defines the answer.
'it is sent up in wrong coach' is the wordplay.
'is sent up' shows that the letters should be reversed in order.
'in' is an insertion indicator.
'wrong' indicates anagramming the letters.
'it' in reverse letter order is 'ti'.
'coach' is an anagram of 'chaoc'.
'ti' inserted within 'chaoc' is 'CHAOTIC'.
Can you help me to learn more?
(Other definitions for chaotic that I've seen before include "badly arranged" , "In a confused state" , "mess" , "In complete disorder" , "In utter confusion" .)