Vintage designation
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vintage designation</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 year that I've seen before include "Time period" , "One-tenth of a decade" , "1961?" , "26 fortnights" , "Time taken by a planet to orbit the sun" .)