Aggravate, intensify (7)
I believe the answer is:
inflame
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">aggravate</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that inflame is a more specific form of the action aggravate)</span><br/ ><br/ >'<span class="explanation-format__original">intensify</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for inflame that I've seen before include "Exacerbate" , "Provoke to anger" , "Excite passionate feelings" , "Incite" , "Make (a situation) worse" .)