Assistant, say, for a general tidy (7)
I believe the answer is:
orderly
This clue is a double definition.
'assistant say for a general' is the first definition.
(assistant to a military officer eg a general)
'tidy' is the second definition.
(similar in meaning)
(Other definitions for orderly that I've seen before include "Junior Army rank" , "Neatly arranged; hospital attendant" , "Well-regulated" , "Hospital or military attendant" , "Systematically, not haphazard" .)