In a quick tempo (6)
I believe the answer is:
presto
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">in a quick tempo</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for presto that I've seen before include "quick to score" , "Moving quickly" , "fast to the maximum" , "In quick tempo (mus.)" , "quickly in bars" .)