Cultivate female member (4)
I believe the answer is:
farm
'cultivate' is the definition.
(farming is a kind of cultivating)
'female member' is the wordplay.
'female' becomes 'f' (abbreviation).
'member' becomes 'arm' (arm is a kind of member**).
'f'+'arm'='FARM'
(Other definitions for farm that I've seen before include "agricultural business" , "Agricultural dwelling" , "Agricultural building" , "Country business" , "Manage land for crops or livestock" .)