Practice pugilism (4)
I believe the answer is:
spar
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">practice pugilism</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 spar that I've seen before include "Translucent mineral" , "dispute" , "Fight - something probably rigged?" , "bar" , "A mineral; nautical pole" .)