Bobby (6)
I believe the answer is:
copper
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bobby</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 copper that I've seen before include "old tub" , "Part of force" , "Ductile metal" , "Reddish-brown metallic element" , "Metal - wash basin" .)