Crossword Genius

Go off course, say about two-fifths of a metre (5)

Ross

I believe the answer is:

stray

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'go off course' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for stray that I've seen before include "Depart from the right path" , "Appearing occasionally" , "Wander off course" , "Drift - isolated" , "Deviate" .)

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