How Scots show regret over European line to be toed (4)

I believe the answer is:

oche

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I'm afraid I can't even guess how this answer relates to the clue.

(Other definitions for oche that I've seen before include "Darts playing line" , "Line from which darts are thrown" , "Line from which a dart player throws" , "missile launching site" , "Missile launchers stand behind this" .)

I've seen this clue in The Sunday Times and The Times.

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