Appalling actor is condemned around Oxford University (9)
I believe the answer is:
atrocious
'appalling' is the definition.
(I've seen this in another clue)
'actor is condemned around oxford university' is the wordplay.
'condemned' indicates an anagram.
'around' is an insertion indicator.
'oxford university' becomes 'OU'.
'actor'+'is'='actoris'
'actoris' is an anagram of 'atrocis'.
'atrocis' placed around 'ou' is 'ATROCIOUS'.
(Other definitions for atrocious that I've seen before include "Horrifying" , "Horrifyingly wicked" , "Dreadful" , "Extremely wicked" , "Appalling" .)