Support engineer behind the scenes (9)
I believe the answer is:
backstage
'behind the scenes' is the definition.
(I've seen this before)
'support engineer' is the wordplay.
'support' becomes 'back' (to back is to support or endorse).
'engineer' becomes 'stage' (I can't justify this - if you can you should believe this answer much more).
'back'+'stage'='BACKSTAGE'
Can you help me to learn more?
(Other definitions for backstage that I've seen before include "away from public view" , "dressing room area" , "Wings etc" , "out of the limelight" , "Behind the scenes (theatrically)" .)