Moved fast like a horse (8)
I believe the answer is:
galloped
'moved fast like a horse' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for galloped that I've seen before include "A peg doll (anag.)" , "what did Joris and Dirck do?" , "Moved fast like a horse" , "'I - - , Dirck - - ...' (Browning)" , "Rode fast" .)