Mention rugged peaks? (5)

I believe the answer is:

speak

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'mention' is the definition.
(thesaurus)

'rugged peaks?' is the wordplay.
'peaks' can be anagrammed to 'SPEAK'.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for speak that I've seen before include "express" , "Utter words" , "Orate" , "give a lecture" , "Talk" .)

I've seen this clue in the Evening Standard.

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