Heidi's home (3)
'heidi's home' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for alps that I've seen before include "Swiss mountains" , "European mountains" , "high areas" , "high points" , "Slap (anag.)" .)
(Other definitions for alp that I've seen before include "Swiss mountain" , "high point" , "High mountain" , "Mountain pasture" , "Mont Blanc, for example" .)