Talk about bozo ultimately in charge being disorganised (7)
I believe the answer is:
chaotic
'disorganised' is the definition.
('chaotic' can be similar in meaning to 'disorganized')
'talk about bozo ultimately in charge' is the wordplay.
'talk' becomes 'chat' (I've seen this before**).
'about' means one lot of letters goes inside another.
'ultimately' indicates one should take the final letters.
'in charge' becomes 'ic'.
The final letter of 'bozo' is 'o'.
'chat' enclosing 'o' is 'chaot'.
'chaot'+'ic'='CHAOTIC'
'being' acts as a link.
(Other definitions for chaotic that I've seen before include "In total disorder" , "Totally disorganised" , "Disorderly, shambolic" , "Confused, disordered" , "In a confused state" .)