Fraudster, one playing tennis you might say? (9)
I believe the answer is:
racketeer
'fraudster' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for racketeer that I've seen before include "Dodgy dealer" , "Crook" , "Mafia-type" , "fraudster" , "dishonest dealer" .)