Perfunctory kiss (4)
I believe the answer is:
peck
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">perfunctory kiss</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 peck that I've seen before include "Bite lightly; a dry measure" , "Kiss; part of bushel" , "Kiss; old dry measure" , "Gregory" , "Perfunctory kiss" .)