Andy Murray let off without penalty (4-4)

I believe the answer is:

scot-free

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'without penalty' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for scot-free that I've seen before include "'Without any punishment whatsoever (4,4)'" , "Unharmed, not punished - like Angus at liberty?" , "Unscathed" , "Secret of being unpunished - like Jock?" , "See 12" .)

I've seen this clue in The Irish Times.

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