Take undue advantage of don covering at university (3,4)
I believe the answer is:
put upon
'take undue advantage of don covering at university' is the definition.
I can't tell whether this definition defines the answer.
'don covering at university' is the wordplay.
'don' becomes 'puton' ('put on' can be a synonym of 'don').
'covering' means one lot of letters goes inside another.
'at university' becomes 'up'.
'puton' placed around 'up' is 'PUT-UPON'.
Can you help me to learn more?
(Other definitions for put upon that I've seen before include "Place on top of - or exploit" , "as Cinderella was" , "Inconvenienced" , "Abused" , "Take advantage of" .)