Excessive supply (4)
I believe the answer is:
glut
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">excessive supply</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 glut that I've seen before include "Excess, surfeit" , "Satiate" , "Superfluity" , "Excessively abundant supply" , "Surfeit or over-supply" .)