Dishonest person — tornado (7)
I believe the answer is:
twister
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">dishonest person</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">tornado</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that tornado can be written as twister)</span><br/ ><br/ ></span>
(Other definitions for twister that I've seen before include "Colloquial name for a tornado" , "'sixties dancer?" , "One-eyed menace" , "Swindler; tornado (US)" , "Tornado (American)" .)