Skiing areas (6)
I believe the answer is:
slopes
'skiing areas' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for slopes that I've seen before include "Of fairly great stature" , "Stretches of falling ground as for skiers" , "Slanting surfaces" , "Inclines, pitches" , "Gradients, inclines" .)