Make one's husband flourish (8)
I believe the answer is:
brandish
'flourish' is the definition.
('brandish' can be a synonym of 'flourish')
'make one's husband' is the wordplay.
'make' becomes 'brand' ('brand' can be a synonym of 'make'**).
'one's' becomes 'is' (roman numeral).
'husband' becomes 'h'.
'brand'+'is'+'h'='BRANDISH'
(Other definitions for brandish that I've seen before include "Wave vigorously" , "Exhibit aggressively" , "Flaunt" , "Flourish aggressively" , "Wave, flourish" .)