Highest peak (7)
I believe the answer is:
everest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">highest peak</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for everest that I've seen before include "High mountain" , "Huge achievement - highest climb" , "A high spot" , "Mountain named after a British surveyor general of India" , "Mount, climbed 1953" .)