Kiss in Kent (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">kiss in kent</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 snog that I've seen before include "Amorously kiss" , "Cuddle, kiss (slang)" , "Kiss and cuddle (sl.)" , "Pet" , "Indulge in amorous activity" .)