Ignores the limit (6)
I believe the answer is:
speeds
'ignores the limit' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for speeds that I've seen before include "Rates of movement" , "Rates of acceleration" , "Goes fast, maybe too fast" , "Moves very quickly" , "these may be in knots" .)