Person guilty of fraud as a tennis player? (9)
I believe the answer is:
racketeer
This clue is a double definition.
'person guilty of fraud' is the first definition.
'a tennis player?' is the second definition.
(I've seen this before)
'as' is the link.
(Other definitions for racketeer that I've seen before include "Fraudulent businessman" , "Capone, for one" , "Dodgy dealer" , "who knows way round court, you might say?" , "fraudster" .)