Second service goes over net to get game (5,4)

'goes over net to get game' is the definition.
I know nothing about this answer so I can't judge whether this works.

'second service' is the wordplay.
I cannot quite understand how this works, but
'second' could be 'mo' (both are short periods of time) and 'mo' is present in the answer.
'service' could be 'use' (I've seen this in other clues) and 'use' is present in the answer.
The remaining letters 'trap' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?