Billiards stroke (5)
I believe the answer is:
masse
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">billiards stroke</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for masse that I've seen before include "'En ..., all together (5)'" , "Swerve shot at billiards" , "Swerving snooker stroke" .)