No husband for more upper-class model (5)
I believe the answer is:
poser
'model' is the definition.
(I know that model can be written as poser)
I cannot understand how the remainder of the clue works.
(Other definitions for poser that I've seen before include "This person's affected" , "Exhibitionist" , "Tricky clue" , "One pretends to be something they are not" , "Puzzling question for the model" .)