Paces for duds? (7)

I believe the answer is:

strides

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This could be a double definition.

'paces' is the first definition.
(I know this)

'duds?' is the second definition.
Although both the answer and definition are plural nouns, I cannot see how they can define each other.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for strides that I've seen before include "pants [STRINE]" , "Paces -- trousers" , "Takes great steps" , "Walks with long paces" , "footsteps" .)

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

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