Chop-chop! (3,1,4,2)
'chop-chop' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for presto that I've seen before include "(In music) fast" , "29 [ADAGIO]? On the contrary" , "Hey ..., according to the magician" , "In quick tempo (mus.)" , "Moving quickly" .)
(Other definitions for get a move on that I've seen before include "Hurry up (colloq.)" , "shift" , "quickly!" , "Speed up" .)