Hold up progress, stymie (9)
I believe the answer is:
stonewall
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">hold up progress</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">stymie</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that stonewall is a type of stymie)</span><br/ ><br/ ></span>
(Other definitions for stonewall that I've seen before include "delay in parliament" , "Refuse to co-operate" , "Play to defend" , "Stand firm" , "Delay or block (a proposal's) progress" .)