The Dutch? How differently they live! (5,4)
I believe the answer is:
other half
I believe this clue is a double definition.
'the dutch?' is the first definition.
(both can informally mean a wife)
'how differently they live' is the second definition.
(reference to the phrase 'how the other half live')
(Other definitions for other half that I've seen before include "people better off than us?" , "Dutch" , "Spouse" , "Wife or hubby" , "partner" .)