Wicket crosspiece (4)
I believe the answer is:
bail
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wicket crosspiece</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 bail that I've seen before include "Item resting on stumps" , "Horizontal piece of cricket wicket" , "Security for release from custody" , "small bar on field" , "Piece placed on top of cricket stumps" .)