The rest requires a little skill at the piano (3)
I believe the answer is:
kip
'the rest' is the definition.
(thesaurus)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for kip that I've seen before include "Sleep, nap (colloq.)" , "Slumber" , "Nap (slang)" , "Snooze" , "Sleep (sl.)" .)