Don't miss the delivery, but co-operate (8)
I believe the answer is:
playball
'co-operate' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'don't miss the delivery' is the wordplay.
'don't miss' becomes 'play' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'the delivery' becomes 'ball' (delivery in cricket).
'play'+'ball'='PLAYBALL'
'but' is the link.
Can you help me to learn more?
(Another definition for playball that I've seen is " Work willingly with others".)