This might be grave sign of stress (6)

I believe the answer is:

accent

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'sign of stress' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for accent that I've seen before include "Distinctive manner of speaking" , "Stress, emphasis" , "Grave, perhaps" , "Distinctive way fo speaking" , "Local way of speaking or enunciation" .)

I've seen this clue in The Sun.

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