Manipulate technician (8)
I believe the answer is:
engineer
I believe this is a double definition.
'manipulate' is the first definition.
(engineer can mean to plan or manipulate)
'technician' is the second definition.
(engineer can mean a technician)
(Other definitions for engineer that I've seen before include "Designer of machines etc" , "Train driver, say" , "Deviser" , "Machine designer, maker or operator" , "Operator of a railway locomotive" .)