Form of industrial action (4-2-4)
(Another definition for work-to-rule that I've seen is " Industrial action".)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">form of industrial action</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 strike that I've seen before include "Work stoppage over industrial dispute" , "Hit at a trade dispute" , "Hit out in industrial dispute" , "make an impact" , "Make a sudden large financial gain" .)