Domineer confident grazier (4,5)

I believe the answer is:

boss cocky

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

'grazier' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'domineer confident' is the wordplay.
'domineer' becomes 'boss' (I've seen this before).
'confident' becomes 'cocky' (I can't justify this - if you can you should believe this answer much more).
'boss'+'cocky'='BOSS COCKY'

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app