Carbon promoted by nuclear installation designer (7)
I believe the answer is:
creator
'designer' is the definition.
(thesaurus)
'carbon promoted by nuclear installation' is the wordplay.
I cannot really understand how this works, but
'carbon' could be 'c' (chemical symbol) and 'c' is located in the answer.
'by' could be 'at' and 'at' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for creator that I've seen before include "Person who makes or invents things" , "The Almighty" , "Maker" , "Originator - God" , "Inventor" .)