A woman's loyalty (5)
I believe the answer is:
faith
This clue is a double definition.
'a woman's' is the first definition.
'loyalty' is the second definition.
(I know that faith is a type of loyalty)
(Other definitions for faith that I've seen before include "A woman" , "Trust in someone" , "Religious belief" , "Strong belief in a supernatural power" , "'..... will move mountains'" .)