Sicken with sweetness (4)
I believe the answer is:
cloy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sicken with sweetness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cloy that I've seen before include "Make weary through over-sentimentality" , "Sicken by glutting" , "Get rather rich" , "Be sickeningly sweet" , "Sicken with sentiment" .)