Drive too fast (5)
I believe the answer is:
speed
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">drive too fast</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for speed that I've seen before include "Tempo - drug" , "Rate of movement" , "Move quickly (and illegally?)" , "Rapidity of movement" , "'More haste, less . . . . .'" .)