American moved secretly (2,6)
I believe the answer is:
in camera
'secretly' is the definition.
(thesaurus)
'american moved' is the wordplay.
'moved' indicates anagramming the letters.
'american' is an anagram of 'IN CAMERA'.
(Other definitions for in camera that I've seen before include "With press and public excluded" , "without full scrutiny?" , "It's not open court" , "behind closed doors" , "Where filming takes place" .)