Most intense (9)
I believe the answer is:
strongest
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">most intense</span>' is the definition.<br/ ><span class="explanation-format__explanation">('strong' can be similar in meaning to 'intense')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for strongest that I've seen before include "Having the greatest strength" , "With greatest power" , "Most muscular or powerful" , "Most physically powerful" , "Most forceful" .)