Rugged peaks, say (5)
I believe the answer is:
'say' is the definition.
'rugged peaks' is the wordplay.
'peaks' anagrams to 'SPEAK'.
Though, I am unsure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for speak that I've seen before include "express" , "Orate" , "Converse" , "Talk" , "Say something" .)