Lowest level robot, to man in the middle (6)
I believe the answer is:
bottom
'lowest level' is the definition.
(thesaurus)
'robot to man in the middle' is the wordplay.
'in the middle' indicates the answer is hidden within the clue (the answer is in the middle of the clue).
'BOTTOM' is hidden in the letters of 'robot to man'.
(Other definitions for bottom that I've seen before include "Least successful position" , "Shakespearean - rear" , "Quark's flavour" , "Lowest part or underside" , "Mechanical" .)