Ban university that’s upset Disney? (6)
I believe the answer is:
outlaw
'ban' is the definition.
(I know that ban is a more specific form of outlaw)
'university that's upset disney?' is the wordplay.
'university' becomes 'ou'.
'that's upset' says the letters should be written in reverse.
'disney?' becomes 'Walt' (Walt Disney).
'walt' in reverse letter order is 'tlaw'.
'ou'+'tlaw'='OUTLAW'
(Other definitions for outlaw that I've seen before include "Irish Tory" , "Robin Hood figure?" , "Ban - bandit" , "bar" , "Ban, prohibit by legislation" .)