Wistful (9)
I believe the answer is:
nostalgic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wistful</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 nostalgic that I've seen before include "Longing for familiar things or persons" , "recollection?" , "down Memory Lane" , "Looking backwards" , "Home sick" .)