Leader to call newspaper's bluff (4)
I believe the answer is:
crag
'bluff' is the definition.
(thesaurus)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for crag that I've seen before include "Avant-garde" , "Rugged rock face" , "Rocky hilltop" , "Steep, overhanging rock" , "Rough, steep rock face" .)