Get together and manage to admit nothing to judge (2-7)

'get together' is the definition.
(to co-operate is to work together)

'manage to admit nothing to judge' is the wordplay.
'manage' becomes 'cope' (manage can mean to cope or do well).
'to admit' is an insertion indicator.
'nothing' becomes 'O' (O resembles 0).
'to judge' becomes 'rate' (rating is a kind of judging).
'cope' going around 'o' is 'coope'.
'coope'+'rate'='CO-OPERATE'

'and' is the link.