Was acceptable (6,6)
I believe the answer is:
passed muster
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">was acceptable</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for passed muster that I've seen before include "Was acceptable" , "Come through examination - was accepted" .)