Translated from Arabic, one sort of exercise (9)

I believe the answer is:

anaerobic

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'sort of exercise' is the definition.

'translated from arabic one' is the wordplay.
'arabic one' anagrams to 'ANAEROBIC'.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for anaerobic that I've seen before include "lacking in inspiration?" , "functional without O2" .)

I've seen this clue in The Sunday Times and The Times.

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