Repeatedly runs bad treaties (8)
I believe the answer is:
iterates
'repeatedly runs' is the definition.
Although both the answer and definition are verbs in their -s form, I cannot see how they can define each other.
'bad treaties' is the wordplay.
'bad' is an anagram indicator.
'treaties' with letters rearranged gives 'ITERATES'.
Can you help me to learn more?
(Other definitions for iterates that I've seen before include "Treatise (anag.)" , "States repeatedly" , "Repeats in treaties" , "Goes over again" , "Stated repeatedly in treatise" .)