Coldly (5)
I believe the answer is:
icily
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">coldly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for icily that I've seen before include "In a cool manner" , "Without feeling" , "In a frosty manner" , "in unfriendly way" , "In a cold manner" .)