Sudden desire to have simple reform around University (7)
I believe the answer is:
impulse
'sudden desire' is the definition.
(I've seen this before)
'simple reform around university' is the wordplay.
'reform' indicates an anagram.
'around' means one lot of letters goes inside another.
'university' becomes 'u'.
'simple' anagrammed gives 'implse'.
'implse' enclosing 'u' is 'IMPULSE'.
'to have' acts as a link.
(Other definitions for impulse that I've seen before include "Sudden urge to act" , "Impel us with sudden urge" , "Impetus - whim" , "Maybe unthinking urge" , "Strong urge to act" .)