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Re a sort of arms timed half way across (3-6)

Ross

I believe the answer is:

mid-stream

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're a sort' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'arms timed half way across' is the wordplay.
'arms timed' can be anagrammed to 'MID-STREAM'.
Though, I'm not clear how the anagram is indicated.

'of' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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