Step in the driest powder (6)

I believe the answer is:

stride

I'm a little stuck... Click here to teach me more about this clue!

'step' is the definition.
(stride is a kind of step)

'the driest powder' is the wordplay.
'driest' can be anagrammed to 'STRIDE'.
Though, I am not sure how the anagram is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for stride that I've seen before include "Take long steps" , "march" , "Take long paces" , "Extended footstep" , "Long pace" .)

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

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