Given promotion, besides, by the editor (9)

'given promotion' is the definition.
The answer and definition can be both to do with social activities as well as being past participle verbs.
Maybe there's a link between them I don't understand?

'besides by the editor' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'editor' could be 'ed' (abbreviation) and 'ed' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?