Modernist left at the start of the week, taking an awfully big step (6)

I believe the answer is:

stride

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'big step' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

(Other definitions for stride that I've seen before include "Long walking step" , "Move with long steps" , "Walk with long steps" , "A big step forward" , "Take long paces" .)

I've seen this clue in The Irish Times.

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