Skiers churning mush (6)
I believe the answer is:
kisser
'mush' is the definition.
(thesaurus)
'skiers churning' is the wordplay.
'churning' indicates anagramming the letters.
'skiers' is an anagram of 'KISSER'.
(Other definitions for kisser that I've seen before include "Mouth (sl.)" , "Skiers (anag.)" , "Slangy face of osculatory origin" , "Casanova" , "Mouth (slang)" .)