Former, past (6)
I believe the answer is:
bygone
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">former</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">past</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ ></span>
(Other definitions for bygone that I've seen before include "Gone by (anag.)" , "Former - well in the past" , "Times past, poetically" , "Erstwhile" , "Olden (days)" .)