Lusty husband comes down to get rude (6)
I believe the answer is:
earthy
'lusty' is the definition.
(both can mean sexually vulgar)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for earthy that I've seen before include "Lusty, crude" , "Crude - vulgar" , "Like soil; uninhibitedly direct" , "Sensible and practical - crude" , "Of the soil, lusty" .)