Slowly but surely (8)

I think it could be either:

Which length description are you looking for?:

4,2,4

steadily

'slowly but surely' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for steadily that I've seen before include "with regularity" , "Surely and regularly" , "In regular and balanced way" , "Regularly, without fluctuation" , "Regularly, constantly" .)

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

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