Clue: Judges note malpractice; its credibility is shot on the 1s (9,6)
Answer: BENCHMARK FIXING
Explanation: Definition: its credibility is shot on the 1s
**BENCH **("judges") + **MARK **("note") + **FIXING **("malpractice") 
*Benchmark fixing is a term relating to foreign exchanges and potential manipulation that can be carried out in a one-minute window every day, but that's as far as my understanding of it goes.