Train to be superior, surrounded by entire confusion (7)
I believe the answer is:
retinue
'train' is the definition.
(people following someone in a procession)
'superior surrounded by entire confusion' is the wordplay.
'superior' becomes 'U' (U can mean upper-class, as in U and non-U speech).
'surrounded by' means one lot of letters goes inside another.
'confusion' indicates an anagram.
'entire' anagrammed gives 'retine'.
'u' going inside 'retine' is 'RETINUE'.
'to be' is the link.
(Other definitions for retinue that I've seen before include "Group of servants with important person" , "Train, escort" , "Body of followers" , "VIP's attendants" , "Attendants, followers" .)