Crossword Genius

Bovine aggressor? (5)

Ross

I believe the answer is:

bully

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

'aggressor?' is the definition.
(I know that bully is a type of aggressor)

'bovine' is the wordplay.
I cannot quite understand how this works, but
'bovine' could be 'bull' (bull is a kind of bovine) and 'bull' is found in the answer.
A single letter 'y' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for bully that I've seen before include "Tinned beef" , "Playground thug" , "Flashman, say" , "Well done" , "Very good" .)

I've seen this clue in the Evening Standard.
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