Race with turns that are slippery (6,3)
I believe the answer is:
cresta run
'race with turns that are slippery' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'race with turns that are slippery' is the wordplay.
'with' is a charade indicator (letters next to each other).
'that are slippery' indicates an anagram (I've seen this in other clues).
'race'+'turns'='raceturns'
'raceturns' anagrammed gives 'CRESTA RUN'.
(Other definitions for cresta run that I've seen before include "Frozen channel" , "tobogganing slope" , "Swiss skeleton toboggan track" .)