Mountain woman having breather (7)
I believe the answer is:
everest
'mountain' is the definition.
(Mount Everest)
'woman having breather' is the wordplay.
'woman' becomes 'Eve' (Eve is an example).
'having' is a charade indicator (letters next to each other).
'breather' becomes 'rest' (a breather is a break or rest).
'eve'+'rest'='EVEREST'
(Other definitions for everest that I've seen before include "Mount, climbed 1953" , "Himalyan peak" , "Mountain named after a British surveyor general of India" , "Tee revs up the mountain" , "Tallest mountain ..." .)