More amiable (10)
I believe the answer is:
friendlier
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">more amiable</span>' is the definition.<br/ ><span class="explanation-format__explanation">('friendly' can be similar in meaning to 'amiable')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for friendlier that I've seen before include "becomes warmer" , "More amicable" .)