Drives too fast (6)
I believe the answer is:
speeds
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">drives too fast</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for speeds that I've seen before include "Goes fast, maybe too fast" , "Moves very quickly" , "Rates of acceleration" , "Rates of movement" , "these may be in knots" .)