Husband caught in fighting ultimately sent sideways (7)
I believe the answer is:
athwart
'sideways' is the definition.
(thesaurus)
'husband caught in fighting ultimately sent' is the wordplay.
'husband' becomes 'h'.
'caught in' indicates putting letters inside.
'fighting' becomes 'atwar' ('at war' can be a synonym of 'fighting'**).
'ultimately' says to take the final letters.
The final letter of 'sent' is 't'.
'h' put within 'atwar' is 'athwar'.
'athwar'+'t'='ATHWART'
(Other definitions for athwart that I've seen before include "Transverse; at an oblique angle" , "What rat is placed across?" , "Crosswise" , "Crossing" , "wrongly" .)