Intern, Nantes, with entirely no end to prescription repeats (8)
I believe the answer is:
iterates
'repeats' is the definition.
('iterate' can be a synonym of 'repeat')
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for iterates that I've seen before include "Treatise (anag.)" , "Stated repeatedly in treatise" , "Repeats in treaties" , "Says again" , "Goes over again" .)