Company promoting local paper (10)
I believe the answer is:
advertiser
'company' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for advertiser that I've seen before include "Part of a newspaper's title" , "who does the plugging" , "One publicising a product (S, not Z)" , "He pushes" , "One who can use multiple media" .)