Rate of travel (5)
I believe the answer is:
speed
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rate of travel</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for speed that I've seen before include "Swiftness" , "Hasten" , "Race" , "Tempo - drug" , "Dispatch" .)