Over-sentimental (4)
I believe the answer is:
twee
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">over-sentimental</span>' is the definition.<br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for twee that I've seen before include "Excessively sentimental" , "Excessively pretty" , "Affectedly cute" , "Overly precious" , "Niminy-piminy" .)