State secrecy provision covers dictator's wife (6)
I believe the answer is:
nevada
'state' is the definition.
(I know that Nevada is a state)
'secrecy provision covers dictator's wife' is the wordplay.
'secrecy provision' becomes 'NDA' (non-disclosure agreement).
'covers' indicates putting letters inside.
'dictator's wife' becomes 'Eva' (Eva Peron, wife of Argentine president Juan Peron).
'nda' enclosing 'eva' is 'NEVADA'.
(Other definitions for nevada that I've seen before include "South-west US state" , "The Silver State" , "Curiously, Dan and Eva are in the US" , "Southwestern US state" , "State of western USA" .)