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gillies
PhilDAS
Dunno if your answer is in here but it sounds related:
https://bicycles.stackexchange.com/questions/43555/choosing-a-rear-derailleur-for-11-42t-cassette-on-a-sram-10-speed-1x-system
https://bicycles.stackexchange.com/questions/46948/sram-11-speed-apex-derailleur-w-sram-gx-10-42t-cassette?rq=1
http://www.bikeradar.com/road/news/article/sram-apex-1-brings-1x-road-to-affordable-level-46492/
"As with its higher-end siblings, Apex 1 has a clutch derailleur that holds the chain taut. It works with 10- and 11-speed SRAM shifters and chains."
Zinn also goes into compatibility issues, so may have mentioned this combo:
http://www.velonews.com/2015/03/bikes-and-tech/technical-faq/technical-faq-10-11-speed-drivetrain-component-compatibility_362722
http://www.velonews.com/2017/01/news/one-ring-to-rule-them-all-single-chainring-setup-tips_427732