Firmly resolved (4,3)
I believe the answer is:
dead set
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">firmly resolved</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 dead set that I've seen before include "Absolutely determined, bent on" , "A determined attack, sounds moribund" , "A determined attack - from extinct group?" , "Complete standstill; sedated (anag.)" , "Bent on - sedated (anag)" .)