A natural elevation (8)
I believe the answer is:
mountain
'a natural elevation' is the definition.
(I know that mountain is a type of natural elevation)
This is all the clue.
(Other definitions for mountain that I've seen before include "Big hill" , "Natural elevation of the earth's surface" , "Large pile" , "with pile of 1d [ADVENTURE]" , "Projecting land-mass" .)