Erstwhile, former (3)
I believe the answer is:
old
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">erstwhile</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">former</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(both can mean previous)</span><br/ ><br/ ></span>
(Other definitions for old that I've seen before include "Advanced in years" , "Obsolete" , "Getting on" , "SECOND PART OF 14" , "Much-used" .)