Regular publication by university breaking record (6)
I believe the answer is:
annual
'regular publication' is the definition.
(I've seen this before)
'university breaking record' is the wordplay.
'university' becomes 'u'.
'breaking' means one lot of letters goes inside another.
'record' becomes 'annal' (I've seen this before**).
'u' inserted into 'annal' is 'ANNUAL'.
'by' is the link.
(Other definitions for annual that I've seen before include "Book; occurring once a year" , "Plant that lives and dies within one year" , "Occurring once every year" , "Yearly publication" , "Happening once each year" .)