Bit of luck (5)
I believe the answer is:
break
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bit of luck</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for break that I've seen before include "Vacation; snap" , "Interruption" , "accumulation of points" , "Short holiday" , "that a billiards player wants as high as possible?" .)