Crossword Genius

As a sort of bonus, I'm creating an anthology (7)

Ross

I believe the answer is:

omnibus

I'm a little stuck... Click here to teach me more about this clue!

'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)" .)

I've seen this clue in The Irish Times.
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