Hostile, unfavourable (8)
I believe the answer is:
inimical
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">hostile</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">unfavourable</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for inimical that I've seen before include "Hostile or in opposition" , "Hostile, antagonistic" , "Hostile, unfavourable" , "In claim I am strangely hostile" , "'Unfriendly, hostile (8)'" .)