Sue the tennis player would do so (2,2,5)
I believe the answer is:
go to court
'player would do so' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'sue the tennis' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'tennis' could be 'court' (court tennis is a kind of tennis) and 'court' is found in the answer.
The remaining letters 'goo' 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?