Craggy hill (3)
I believe the answer is:
tor
'craggy hill' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tor that I've seen before include "feature of Glastonbury" , "fell" , "Rot on a Cornish hill" , "Feature of Dartmoor" , "Rocky outcrop" .)