Harry Truman's wife (4)
I believe the answer is:
bess
'harry truman's wife' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bess that I've seen before include "Our Good Queen" , "Black - was Dick Turpin's horse" , "Queen Elizabeth 1 (sl)" , "Operatic mate for Porgy" , "Elizabeth (dim.)" .)