Mountain woman in the first place needs sleep (7)
I believe the answer is:
everest
'mountain' is the definition.
(Mount Everest)
'woman in the first place needs sleep' is the wordplay.
'woman in the first place needs' becomes 'eve' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sleep' becomes 'rest' (synonyms).
'eve'+'rest'='EVEREST'
Can you help me to learn more?
(Other definitions for everest that I've seen before include "Mountain named after a British surveyor general of India" , "High mountain" , "Highest Himalayan mountain" , "Himalayan mount" , "High peak" .)