Too old (4,2)
I believe the answer is:
past it
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">too old</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for past it that I've seen before include "Informally too old to function" , "Unable to function any more, perhaps due to age" , "No longer capable" , "aged" , "No longer in one's prime" .)