Crest (5)

I believe the answer is:
ridge
'crest' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ridge that I've seen before include "Line where two upward sloping surfaces meet" , "watershed ..." , "there's a lot of pressure in it" , "German Baltic port, Buxtehude home" , "Top of sloping roof" .)