Very slow speed (6,4)
I believe the answer is:
snails pace
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">very slow speed</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 snails pace that I've seen before include "no rush" , "making slow progress" , "at a very low rate" , "Slow rate of progress" , "Very slow speed" .)