Touch of frost (3)
I believe the answer is:
nip
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">touch of frost</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for nip that I've seen before include "Pinch or squeeze sharply" , "In the air, it feels cold" , "severe cold" , "pop and > have a bite" , "Dash" .)