Didn't dillydally (4)
I believe the answer is:
sped
'didn't dillydally' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sped that I've seen before include "Moved quickly" , "Made haste" , "got a move on" , "Dashed" , "was 8 [FLEET]" .)