Crossword Genius

Whereon sportsmen can possibly step out of line? (5)

Ross

I believe the answer is:

piste

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'line?' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for piste that I've seen before include "slippery slope" , "Ski-slope" , "Ski track" , "Skiing trail" , "Skiing course" .)

I've seen this clue in the Evening Standard.
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