Counterfeit, simulate (5)
I believe the answer is:
feign
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">counterfeit</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">simulate</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that simulate can be written as feign)</span><br/ ><br/ ></span>
(Other definitions for feign that I've seen before include "Simulate, fake" , "Pretend, put on show of" , "Dissemble" , "Counterfeit, simulate" , "Pretend to experience" .)