Working team OK to receive ball

I believe the answer is:

onside

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

'ok to receive ball' is the definition.
I can't tell whether this defines the answer.

'working team' is the wordplay.
'working' becomes 'on'.
'team' becomes 'side' (I've seen this before).
'on'+'side'='ONSIDE'

Can you help me to learn more?

(Other definitions for onside that I've seen before include "In agreement (colloq.)" , "in position to proceed?" , "not breaking rules" , "legitimate" , "(In football) not in forbidden zone" .)

I've seen this clue in The Telegraph.

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