Rest during ski practice (3)
I believe the answer is:
kip
'rest' is the definition.
(kipping is a kind of resting)
'during ski practice' is the wordplay.
'during' indicates the answer is hidden within the clue.
'KIP' is hidden within 'ski practice'.
(Other definitions for kip that I've seen before include "Sleep (sl.)" , "Slumber" , "Short sleep" , "Snooze" , "Sleep, nap (colloq.)" .)