Managed game in large part and cattle farms (7)
I believe the answer is:
ranches
'cattle farms' is the definition.
('ranch' can be a synonym of 'cattle farm')
'managed game in large part' is the wordplay.
'managed' becomes 'ran' (I've seen this before).
'game in large part' becomes 'ches' (I can't explain this - if you can you should give a lot more credence to this answer).
'ran'+'ches'='RANCHES'
'and' is the link.
Can you help me to learn more?
(Other definitions for ranches that I've seen before include "Farmsteads (USA)" , "Large US farms" , "18 down Large cattle farms" .)