Close, in hide and seek (4)
I believe the answer is:
warm
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">close in hide and seek</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 warm that I've seen before include "Cordial" , "(Of a scent) fresh" , "Approaching target" , "Welcoming - getting close!" , "On the brink of making discovery" .)