Traditionalist nomadic Bedouin assuming the mantle of husband (9)
I believe the answer is:
hidebound
'traditionalist' is the definition.
('hidebound' can be a synonym of 'traditionalist')
I cannot understand how the rest of the clue works.
(Other definitions for hidebound that I've seen before include "Narrow-minded - ultra-conservative" , "very conservative" , "Restricted by petty rules" , "Narrow" , "Bigoted" .)