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At the very commencement of trouble, get away for a rest (8)

Ross

I believe the answer is:

outbreak

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'at the very commencement of trouble' is the definition.
I can't judge whether this defines the answer.

'away for a rest' is the wordplay.
'away' becomes 'out' (synonyms).
'for' means one lot of letters go next to another.
'a rest' becomes 'break' (I've seen this before).
'out'+'break'='OUTBREAK'

'get' acts as a link.

Can you help me to learn more?

(Other definitions for outbreak that I've seen before include "Sudden development of disease etc" , "Sudden onset (of war, disease, etc)" , "disturbance" , "Sudden start" , "Sudden spontaneous occurrence" .)

I've seen this clue in the Evening Standard.
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