Rather old (7)
I believe the answer is:
elderly
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rather 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 elderly that I've seen before include "Of advanced years" , "Fairly old, past middle age" , "Rather old" , "Somewhat old" , "Long in the tooth" .)