Practises cycling, getting muscle injury (6)

I believe the answer is:

strain

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'muscle injury' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for strain that I've seen before include "Injure (a muscle); distinct breed" , "Strive; ancestry" , "Remove by passing through a filter" , "Wrench; melody" , "Pass through a colander" .)

I've seen this clue in The Guardian.

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