Bridge blunder (6)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bridge blunder</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for renege that I've seen before include "Default" , "Fail to keep promise, or revoke in cards" , "Go back on an obligation" , "South American cowboy" , "Fail to honour an obligation" .)