Bluff chap (5)
I believe the answer is:
cliff
This clue is a double definition.
'bluff' is the first definition.
(thesaurus)
'chap' is the second definition.
(Other definitions for cliff that I've seen before include "High, steep rock face" , "Steep high rockface" , "stony face?" , "Precipice" , "A sheer rock face, in mountain or by sea" .)