Illegal delivery (2-4)
I believe the answer is:
no-ball
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">illegal delivery</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for no-ball that I've seen before include "Illegal delivery by bowler in cricket" , "Extra, in cricket" .)