Steep high cliff (4)
I believe the answer is:
scar
'steep high cliff' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for scar that I've seen before include "Mark left by old wound" , "area of wound" , "Bare rocky cliff - injury" , "Old wound - bare cliff" , "Skin blemish - bare crag" .)