Modest order cut by husband (6)
I believe the answer is:
chaste
'modest' is the definition.
(I've seen this before)
'order cut by husband' is the wordplay.
'order' becomes 'caste' (I've seen this in other clues).
'cut by' indicates putting letters inside.
'husband' becomes 'h'.
'caste' placed around 'h' is 'CHASTE'.
(Other definitions for chaste that I've seen before include "Unsullied" , "Maidenly" , "He-cats could be virtuous, strangely" , "Sachet (anag)" , "virgin" .)