Potato dish (4)
I believe the answer is:
mash
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">potato dish</span>' is the definition.<br/ ><span class="explanation-format__explanation">(mashed potato)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for mash that I've seen before include "Sham sort of pulp" , "Soft, pulpy mass" , "Pummel" , "Creamed potatoes" , "Forces hospital" .)