Rocky hill (3)
'rocky 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 "Rising" , "Rot on a Cornish hill" , "Pillar of rock" , "Hill or rocky peak" , "rise" .)
(Other definitions for col that I've seen before include "Depression in range of mountains" , "Mountain saddle" , "Pass between hills" , "Low point of saddle between two peaks" , "Feature of mountain" .)