Claim there's no rule for rogue EC states (4,4)
I believe the answer is:
test case
'claim there's no rule' is the definition.
I can't judge whether this defines the answer.
'rogue ec states' is the wordplay.
'rogue' indicates an anagram (letters go rogue).
'ec'+'states'='ecstates'
'ecstates' is an anagram of 'TEST-CASE'.
'for' is the link.
Can you help me to learn more?
(Other definitions for test case that I've seen before include "Legal precedent-setter" , "important legal action" , "Legal action where the outcome will serve as a precedent" , "Legal action serving as a precedent" , "that could set a precedent" .)