George Washington's wife (6)
I believe the answer is:
martha
'george washington's wife' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for martha that I've seen before include "- Jones, Doctor Who companion" , "Wife of George Washington" , "Sister of Mary and Lazarus (New Testament)" , "Lazarus's sister (Luke)" , "George Washington's wife; at harm (anag.)" .)