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Heads rolled in final contest, off the mark (6)

Ross

I believe the answer is:

astray

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

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

Can you help me to learn more?

(Other definitions for astray that I've seen before include "Off the correct track" , "Wandering off the track" , "(Gone) in wrong direction" , "Well off course" , "wrong way" .)

I've seen this clue in The Hindu.
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