Like the king of the jungle (7)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">like the king of the jungle</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 leonine that I've seen before include "Catty" , "Like the king of the beasts" , "about a big beast" , "Like a wild animal" , "It's like Aslan" .)