Speed of progress (4)
I believe the answer is:
rate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">speed of progress</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 rate that I've seen before include "Velocity" , "Cost" , "Capital of the Philippines" , "Find fault with - speed - charge" , "See 12" .)