Harness horse (5)
'harness horse' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pacer that I've seen before include "Horse; one setting speed" , "walker?" , "early race leader?" , "Racing horse with an unusual gait" , "One setting race speed" .)
'harness horse' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for trotter that I've seen before include "Harnessed mount" , "Steady horse; pig's foot" , "Job Dickens created" , "horse getting sulky, say" , "Food for man" .)