As a sort of bonus, I'm creating an anthology (7)
I believe the answer is:
omnibus
'anthology' is the definition.
(I know that omnibus is a type of anthology)
'as a sort of bonus i'm creating an' is the wordplay.
'bonus i'm' anagrams to 'OMNIBUS'.
Though, I am unsure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for omnibus that I've seen before include "Book of collected works - vehicle" , "Several books in one" , "reading this" , "Multi-part edition" , "Bumper (volume, edition)" .)