Heavy and sticky (6)
I believe the answer is:
stodgy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">heavy and sticky</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 stodgy that I've seen before include "Heavy and sticky" , "(Of food) heavy, rich" , "Dull and heavy" , "(Of food) solid and heavy" , "Boringly conventional" .)