One day, study ARA properly (8)

I believe the answer is:

saturday

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'one day' is the definition.

'study ara properly' is the wordplay.
'study ara' can be anagrammed to 'SATURDAY'.
Though, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for saturday that I've seen before include "Samedi or Sabato or Samstag" , "Jewish Sabbath" , "24hrs ago?" , "Day named for the sixth plant from the sun" , "- Night Fever, 1977 film" .)

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

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