Crossword Genius

A shot sunk in a single stroke (4,2,3)

Ross

I believe the answer is:

hole in one

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

'a single stroke' is the definition.
The definition suggests a singular noun which matches the answer.

'a shot sunk in' is the wordplay.
I cannot really see how this works, but
'a' could be 'one' and 'one' is found within the answer.
'in' is found in the answer.
The remaining letters 'hole' is a valid word which might be clued in a way I don't see.
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 "The best possible shot by a golfer" , "Golfing feat" , "Singular achievement by golfer - literally" , "Singular score in golf" .)

I've seen this clue in The Independent.
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