Short crowbar (5)
I believe the answer is:
jemmy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">short crowbar</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 jemmy that I've seen before include "Thief's crowbar" , "Burglar's tool" , "Burglar's short crowbar" , "one's used to prise)" .)