Nurse releases husband from danger (5)
I believe the answer is:
treat
'nurse' is the definition.
(I know that nurse is a more specific form of the action the treat)
'husband from danger' is the wordplay.
'husband' becomes 'h' (abbreviation).
'from' indicates named letters should be taken away.
'danger' becomes 'threat' (threat can mean a danger or risk).
'threat' with 'h' removed is 'TREAT'.
'releases' acts as a link.
(Other definitions for treat that I've seen before include "Deal with; an outing" , "An indulgence; handle" , "Minister - buy one a drink" , "Apply remedies" , "Entertain at one's own expense" .)