Hill, rocky peak (3)
I believe the answer is:
tor
This clue is a double definition.
'hill' is the first definition.
(I know that tor is a type of hill)
'rocky peak' is the second definition.
(a tor is a rocky hill)
(Other definitions for tor that I've seen before include "A rocky hill in Devon" , "Rising" , "Rot on a hill in Devon" , "Rot on a Cornish hill" , "fell" .)