Husband rather routine? (5)
I believe the answer is:
habit
'routine?' is the definition.
(thesaurus)
'husband rather' is the wordplay.
'husband' becomes 'h'.
'rather' becomes 'abit' (I've seen this before).
'h'+'abit'='HABIT'
(Other definitions for habit that I've seen before include "bent" , "Custom or monk's robe" , "Custom or established practice" , "It's worn in order" , "Usual practice; garment" .)