Disorganised coach is confused about it on reflection (7)
I believe the answer is:
chaotic
'disorganised' is the definition.
(similar in meaning)
'coach is confused about it on reflection' is the wordplay.
'is confused' indicates anagramming the letters.
'about' indicates putting letters inside.
'on reflection' shows that the letters should be reversed in order.
'it' back-to-front is 'ti'.
'coach' is an anagram of 'chaoc'.
'chaoc' placed around 'ti' is 'CHAOTIC'.
(Other definitions for chaotic that I've seen before include "mess" , "Never ordered" , "In complete disorder" , "In total disorder" , "Disorderly, shambolic" .)