Ensign (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ensign</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for flag that I've seen before include "Become limp" , "appears to grow languid" , "Emblem - iris - wilt" , "appearing to decline" , "Standard - paving-stone" .)