Jemmy (7)
I believe the answer is:
crowbar
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">jemmy</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 crowbar that I've seen before include "Burglar's tool, perhaps" , "one able to afford purchase" , "Powerful opener" , "Lever used for opening or lifting" , "Tool for breaking and entering" .)