National flags (9)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">national flags</span>' is the definition.<br/ ><span class="explanation-format__explanation">('ensign' can be a synonym of 'national flag')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ensigns that I've seen before include "standards" , "Sensing (anag)" , "US naval officers" , "Flags for naval officers" , "(Military) flags" .)
(Other definitions for standards that I've seen before include "Reference points for comparison" , "Flags for bases of measurement" , "Desired levels of quality" , "Principles of decent behaviour" , "Norms in flags?" .)