John Adams's wife (7)
I believe the answer is:
abigail
'john adams's wife' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for abigail that I've seen before include "lady!" , "domestic" , "Lady's maid (once); David's wife (I. Sam.)" , "Woman's name - old lady's maid" , "She served David" .)