National flag (5,4)
I believe the answer is:
union jack
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">national flag</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for union jack that I've seen before include "standard for us" , "Colours" , "appears up the pole" , "National flag of U.K." , "The British flag" .)