Trotter's kin (5)
I believe the answer is:
pacer
(Other definitions for pacer that I've seen before include "Racing horse with an unusual gait" , "One setting race speed" , "setting the rate" , "Competitor" , "One walking steadily" .)
I believe the answer is:
pacer
(Other definitions for pacer that I've seen before include "Racing horse with an unusual gait" , "One setting race speed" , "setting the rate" , "Competitor" , "One walking steadily" .)