Break in to repair rupture located within (6)
I believe the answer is:
irrupt
'break in' is the definition.
(I've seen this before)
'repair rupture located within' is the wordplay.
'within' indicates the answer is hidden within the clue.
'IRRUPT' is hidden within 'repair rupture located'.
'to' is the link.
(Other definitions for irrupt that I've seen before include "Enter forcibly and suddenly" , "Enter forcibly or violently" , "Break, rush, in" .)