Corrupt towards husband, something ending in big fight (7)
I believe the answer is:
warpath
'something ending in big fight' is the definition.
(course leading to war)
'corrupt towards husband' is the wordplay.
'corrupt' becomes 'warp'.
'towards' becomes 'at'.
'husband' becomes 'h' (abbreviation).
'warp'+'at'+'h'='WARPATH'
(Other definitions for warpath that I've seen before include "On the - means angry" , "One's heading for conflict when on it" , "Route taken by militant Red Indians" , "Road to battle" , "On this one is pursuing troublemakers" .)