Mountain woman needs breather (7)
I believe the answer is:
everest
'mountain' is the definition.
(I've seen this before)
'woman needs breather' is the wordplay.
'woman' becomes 'Eve' (Eve is an example).
'needs' means one lot of letters go next to another.
'breather' becomes 'rest' (I've seen this before).
'eve'+'rest'='EVEREST'
(Other definitions for everest that I've seen before include "Himalayan peak" , "Huge achievement - highest climb" , "The highest mountain of all (7)" , "One conquered in 1953" , "A mountain to climb" .)