Fire (up) (3)
(Other definitions for rev that I've seen before include "Minister" , "serviceman?" , "Clergyman, or woman (abbr)" , "Cleric" , "Run (engine) quickly" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fire up</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 ignite that I've seen before include "Burn" , "Catch fire; provoke" , "Cause to catch fire" , "Swan constellation" , "Torch" .)