Edwards agreed on Sunday to remain as Wales defence coach for at least another four years - ending England's hopes of luring him away.
However former Wasps head coach Edwards could return to the Premiership with the 45-year-old already in talks with one club about working with them on a part-time basis.
Edwards, though, will also split his time working with Welsh Premiership sides as well as the Wales age group teams.
WRU chief executive Roger Lewis said: "Under the terms of the contract, Shaun will be released one day a week, save Test match weeks, to work with an English Premiership club.
"I have also negotiated the opportunity for Shaun to work at times with Welsh Premiership clubs, which is particularly exciting for this level of our game.
"We have an outstanding team of coaches and backroom staff working under WRU head coach Warren Gatland and Shaun's role as defence coach within that team is something quite unique.
"Talks began informally and discreetly in New Zealand with Shaun, and have continued over the past two weeks.
"I am particularly pleased to add that, in addition to his extended senior national team duties under Warren, Shaun will also be working with WRU head of rugby Joe Lydon within the WRU National Academy.
"Shaun will work with the Wales Under-20s, 18s and 16s. This is part of our strategy to ensure our coaches have influence over our elite players early in their development.
"Our structures are in place both on and off the field to take us up to and beyond the Rugby World Cup in 2015, all underpinned by sound financial management.
"The Welsh rugby public, who have been so loyal to us, all can look forward to the next four years with great anticipation."
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