Skis breaking at a touch! (4)
I believe the answer is:
kiss
'a touch' is the definition.
(I know that kiss is a type of touch)
'skis breaking' is the wordplay.
'breaking' is an anagram indicator.
'skis' anagrammed gives 'KISS'.
'at' acts as a link.
(Other definitions for kiss that I've seen before include "Affectionate greeting" , "Buss" , "Touch lightly - a sign of affection" , "Cross" , "Embrace" .)