Reign (4)
I believe the answer is:
rule
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reign</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rule that I've seen before include "Govern with straight stick?" , "Control; thin line" , "Exercise power (over)" , "Regulation, principle" , "Strip" .)