Victoria takes it back, Scrooge is a bully (10)

'a bully' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?

'victoria takes it back scrooge' is the wordplay.
'victoria takes' becomes 'vic' (I can't justify this - if you can you should give a lot more credence to this answer).
'back' says the letters should be written in reverse.
'scrooge' becomes 'miser' (Dickens' Ebenezer Scrooge is a miser).
'it' written backwards gives 'ti'.
'vic'+'ti'+'miser'='VICTIMISER'

'is' acts as a link.

Can you help me to learn more?