Crossword Genius

Stressed from being off centre? Au contraire! (2,4)

Ross

I believe the answer is:

on edge

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

I don't understand the rest of the clue.

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(Other definitions for on edge that I've seen before include "All agog" , "close to border" , "Tense and irritable, very nervous" , "Twitchy" , "Cliff-top walker may be" .)

I've seen this clue in The Guardian.
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