Inferior substitute (6)
I believe the answer is:
ersatz
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">inferior substitute</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ersatz that I've seen before include "Phoney as in Germany" , "'Artificial, not genuine (6)'" , "Mock" , "Spurious" , "Artificial or inferior imitation" .)