Runners having a naughty kiss? (4)
I believe the answer is:
skis
'runners' is the definition.
(ski is a kind of runner)
'a naughty kiss?' is the wordplay.
'a naughty' is an anagram indicator.
'kiss' with letters rearranged gives 'SKIS'.
'having' is the link.
(Other definitions for skis that I've seen before include "Swoops downhill" , "Snow runners" , "Engages in a winter sport" , "More than one runner" , "Travels on snow" .)