Days-old (5)
I believe the answer is:
stale
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">days-old</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for stale that I've seen before include "Mouldy or hackneyed" , "no longer bearing interest?" , "Least (anag.)" , "Not fresh, being least" , "Musty or hackneyed" .)