Cruel hill (4)
I believe the answer is:
fell
I believe this is a double definition.
'cruel' is the first definition.
(I've seen this before)
'hill' is the second definition.
(thesaurus)
(Other definitions for fell that I've seen before include "Knock down; hill" , "Abated" , "Lethal" , "Keeled over" , "Cut down; hill" .)