Less friendly (6)
I believe the answer is:
colder
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">less friendly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for colder that I've seen before include "Of a lower temperature" , "Less warm" , "More nippy" , "Not so hot" .)