God of thunder (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">god of thunder</span>' is the definition.<br/ ><span class="explanation-format__explanation">(Norse god of thunder)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for thor that I've seen before include "Thunderous god" , "Thursday is named after this Scandinavian god" , "Norse god of thunder - a weekday is named after him" , "The Thunderer" , "One of the Norse gods" .)