Crossword Genius

What happens when a golfball sliced? Already mentioned (9)

Ross

I believe the answer is:

aforesaid

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'already mentioned' is the definition.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for aforesaid that I've seen before include "earlier" , "Above-mentioned" , "The one previously mentioned" , "previously referred to" .)

I've seen this clue in The Everyman puzzle in The Observer.
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