Broken arm support (5)
I believe the answer is:
sling
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">broken arm support</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sling that I've seen before include "Throw, fling" , "Bandage support; hurl" , "Catapult - shoe - support" , "Catapult or support as for injured arm" , "Chuck; support for damaged arm" .)