Always set out for peak (7)
I believe the answer is:
everest
'for peak' is the definition.
(Everest is an example)
'always set out' is the wordplay.
'always' becomes 'ever' (synonyms).
'out' indicates an anagram (out can mean wrong or inaccurate).
'set' with letters rearranged gives 'est'.
'ever'+'est'='EVEREST'
(Other definitions for everest that I've seen before include "Tee revs up the mountain" , "The world's highest mountain" , "Great achievement" , "One conquered in 1953" , "Highest Himalayan mountain" .)