Mentally picture (7)
I believe the answer is:
imagine
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">mentally picture</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 imagine that I've seen before include "Picture in mind, envisage" , "Form a mental picture" , "Fancy - dream" , "Suppose; think up" , "Reckon" .)