Halts but still makes progress (5)

I believe the answer is:

limps

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'halts' is the definition.
The answer and definition can be both acts as well as being plural nouns.
Perhaps there's an association between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for limps that I've seen before include "Hobbles" , "Walks haltingly" .)

I've seen this clue in The Globe and Mail.

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