Worker essentially proper at orchestrating (8)
I believe the answer is:
operator
'worker' is the definition.
(I've seen this before)
'essentially proper at orchestrating' is the wordplay.
'essentially' indicates a hidden word (essence can mean the inside of something).
'OPERATOR' is hidden within 'proper at orchestrating'.
(Other definitions for operator that I've seen before include "Manipulative type of person" , "Person who directs or controls, machine say (8)." , "Switchboard worker" , "Person running a business" , "Controller of machinery" .)