Crossword Genius

Knee surgeon’s ball? (3-6)

Ross

I believe the answer is:

leg-cutter

'ball?' is the definition.
(type of delivery in cricket)

'knee surgeon's' is the wordplay.
'knee' becomes 'leg' (I can't justify this - if you can you should give a lot more credence to this answer).
'surgeon' becomes 'cutter' (surgeons cut during surgery).
'leg'+'cutter'='LEG-CUTTER'

(Another definition for leg-cutter that I've seen is " Fast ball at cricket".)

I've seen this clue in The Times.
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