Mount woman then sleep (7)
I believe the answer is:
everest
'mount' is the definition.
(I've seen this before)
'woman then sleep' is the wordplay.
'woman' becomes 'eve' (Eve is an example).
'then' means one lot of letters go next to another.
'sleep' becomes 'rest' ('rest' can be a synonym of 'sleep').
'eve'+'rest'='EVEREST'
(Other definitions for everest that I've seen before include "Mountain named after a British surveyor general of India" , "High peak" , "Huge achievement - highest climb" , "Highest Himalayan mountain" , "A mountain to climb" .)