Light kiss (4)
I believe the answer is:
peck
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">light kiss</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 peck that I've seen before include "One quarter of a bushel" , "lot of pints" , "Perfunctory kiss" , "Kiss; old dry measure" , "Nibble" .)