One taking orders from men unnecessarily (3)
I believe the answer is:
nun
'one taking orders' is the definition.
(woman who has taken religious orders)
'from men unnecessarily' is the wordplay.
'from' indicates a hidden word.
'NUN' is hidden within 'men unnecessarily'.
(Other definitions for nun that I've seen before include "Mother Teresa, maybe" , "Mother Superior, perhaps" , "Holy sister" , "Religious woman, a palindrome" , "Member of religious order" .)