Lying under oath (9)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lying under oath</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for perjury that I've seen before include "False swearing" , "Offence in court" , "Lying in court" , "The telling of a lie under oath" , "Offence of lying under oath" .)