Runner somewhat unskilled (3)
I believe the answer is:
ski
'runner' is the definition.
(something which 'runs', ie moves quickly on snow)
'somewhat unskilled' is the wordplay.
'somewhat' says the answer is hidden in the clue.
'SKI' can be found hidden inside 'unskilled'.
(Other definitions for ski that I've seen before include "Narrow runner built for travel in snow" , "Go downhill fast, perhaps?" , "Mountain runner" , "Glide or race across snow with feet attachments" , "Take part in a winter sport" .)