Crank (up) (3)
I believe the answer is:
rev
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">crank up</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 rev that I've seen before include "Increase speed of (an engine)" , "Accelerate (abbrev.)" , "Clergyman, or woman (abbr)" , "serviceman?" , "Clergy title" .)