Big gun (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">big gun</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 cannon that I've seen before include "Caught girl on piece of artillery" , "Large artillery piece" , "Great gun" , "Weapon firing large balls" , "Billiard shot or large gun" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">big gun</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for mogul that I've seen before include "Powerful man" , "big shot" , "Indian emperor - important person" , "bigwig" , "Magnate; mound of hard snow on a ski slope" .)