Like old bread (5)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">like old bread</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 stale that I've seen before include "Boring" , "Unfresh" , "past the sell-by date" , "Not fresh, being least" , "Musty - out of date" .)