Hill or rocky peak (3)
I believe the answer is:
tor
This clue is a double definition.
'hill' is the first definition.
(tor is a kind of hill)
'rocky peak' is the second definition.
(a tor is a rocky hill)
(Other definitions for tor that I've seen before include "High, rocky, bare hill" , "eminence" , "A rocky hill in Devon" , "Rocky outcrop" , "Rot on rocky peak" .)