Neither warm nor very cold (4)
I believe the answer is:
cool
'neither warm nor very cold' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for cool that I've seen before include "Unemotional; excellent" , "Rain heavily (colloq.)" , "Quite cold" , "Calm and unemotional" , "Calm and collected" .)