Lady Hamilton (4)
I believe the answer is:
emma
'lady hamilton' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for emma that I've seen before include "Jane Austen novel and Nelson's lover" , "Retired chief in Ian Fleming" , "Eponymous heroine" , "Austen character" , "Mrs Bovary" .)