Crossword Genius

How the golfer said "Not both in need of darning"? (4,2,3)


I believe the answer is:

hole in one

I'm a little stuck... Click here to teach me more about this clue!

'darning?' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

'how the golfer said not both in need of' is the wordplay.
I cannot really see how this works, but
'not' could be 'non' (I've seen this in other clues) and 'non' is located in the answer.
'of' could be 'o' and 'o' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for hole in one that I've seen before include "Singular achievement by golfer - literally" , "The best possible shot by a golfer" , "Golfing feat" , "Singular score in golf" .)

I've seen this clue in the Evening Standard.
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