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Runners smooch when son moves into the lead (4)

Ross

I believe the answer is:

skis

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'runners' is the definition.
(ski is a kind of runner)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for skis that I've seen before include "Snow runners" , "Travels on snow" , "Engages in a winter sport" , "More than one runner" , "On these in slalom" .)

I've seen this clue in The Telegraph.
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