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Jogger with one hand in rock (7)

Ross

I believe the answer is:

trotter

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(Other definitions for trotter that I've seen before include "Pig's foot - type of racing horse" , "Steady horse; pig's foot" , "Foot of pig" , "Job Dickens created" , "horse getting sulky, say" .)

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