Endless charity around University provided by student group and former student (7)
I believe the answer is:
alumnus
'former student' is the definition.
(I've seen this before)
'endless charity around university provided by student group' is the wordplay.
'endless' means to look at the middle letters.
'charity' becomes 'national trust' (preservation charity).
'around university' becomes 'lum' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'provided by' means one lot of letters go next to another.
'student group' becomes 'NUS' (National Union of Students).
The centre of 'nationaltrust' is 'a'.
'a'+'lum'+'nus'='ALUMNUS'
'and' is the link.
Can you help me to learn more?
(Other definitions for alumnus that I've seen before include "Former school pupil" , "Former pupil or student" , "(US) college graduate" , "Old pupil" , "Ex-pupil" .)