Crossword Genius

A butchery firm owned by a combine? (5,7)

Ross

I believe the answer is:

joint concern

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

'owned by a combine?' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'a butchery firm' is the wordplay.
'a butchery' becomes 'joint' (I am not sure about this - if you are sure you should believe this answer much more).
'firm' becomes 'concern' (both can mean an business).
'joint'+'concern'='JOINT CONCERN'

Can you help me to learn more?

I've seen this clue in The Globe and Mail and The Irish News.
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