Possible Clues:

• It's swung at Wimbledon
• Wimbledon pro shop career?
• Service deliverer that can be changed, for instance, with 7
• Irritating noise from Sharapova or her highly-strung companion?
• Square in Clare scheme is bound to be useful in 14 across
• Thing swung on a court
• Tool used for those who serve
• Equipment used in the services?
• What one needs when required for court service
• Caught up with small fraud that's handled in court