French national flag (9)
I believe the answer is:
tricolour
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">french national flag</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 tricolour that I've seen before include "Standard of French perhaps" , "French national flag" , "Having or involving three colours" .)