Close, in hide and seek (4)
I believe the answer is:
warm
'close in hide and seek' is the definition.
(I've seen this in another clue)
This is the entire clue.
(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" .)