I leave fresh aspirin for muscle injury (6)

I believe the answer is:

sprain

'muscle injury' is the definition.

I cannot understand how the rest of the clue works.

(Other definitions for sprain that I've seen before include "Wrench (limb)" , "sign of strain" , "Wrench or twist" , "Minor muscular injury" , "Turn" .)

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

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