Sled-dog race command (4)
I believe the answer is:
mush
'sled-dog race command' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mush that I've seen before include "Cloying sentimentality" , "Soft pulpy mass" , "order for dogs" , "Pulpy mass - sloppy sentimentality - command to sled dogs" , "Instruction to huskies" .)