Husband's trapped in bar, cut off (5)
I believe the answer is:
shave
'cut off' is the definition.
(I've seen this before)
'husband's trapped in bar' is the wordplay.
'husband' becomes 'h' (abbreviation).
'trapped in' means one lot of letters goes inside another.
'bar' becomes 'save' (both can mean 'except').
'h' going inside 'save' is 'SHAVE'.
(Other definitions for shave that I've seen before include "Remove hair (which could be narrow)" , "Daily activity perhaps" , "Use a razor" , "A close one is a narrow escape" , "Smooth surface" .)