Backward-looking (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">backward-looking</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 retro that I've seen before include "Backward looking" , "Imitating a style from the recent past" , "Old-fashioned style" , "Fashion of yesteryear" , "bit of nostalgia" .)
(Other definitions for retrospective that I've seen before include "Looking backwards" , "Looking back" .)