Longer in the tooth (5)
I believe the answer is:
older
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">longer in the tooth</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 older that I've seen before include "Former" , "Less young" , "More elderly" , "Earlier" , "More senior" .)