Song of the past (5)
I believe the answer is:
oldie
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">song of the past</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for oldie that I've seen before include "forties film, say" , "Perennially popular song or film, often golden" , "The --, UK magazine" , "Still popular hit" , "classic film perhaps" .)