Disgusting old woman thus turning up outside university (6)
I believe the answer is:
odious
'disgusting' is the definition.
(thesaurus)
'old woman thus turning up outside university' is the wordplay.
'old woman' becomes 'odi' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'thus' becomes 'so' (synonyms).
'turning up' is a reversal indicator.
'outside' indicates putting letters inside.
'university' becomes 'u'.
'so' back-to-front is 'os'.
'os' going around 'u' is 'ous'.
'odi'+'ous'='ODIOUS'
Can you help me to learn more?
(Other definitions for odious that I've seen before include "Detestable, execrable" , "Loathsome and repulsive" , "Repellent" , "Contemptible" , "Replusive, abhorrent (6)" .)