Cordial, neither hot nor cold (4)
I believe the answer is:
warm
I believe this clue is a double definition.
'cordial' is the first definition.
('warm' can be similar in meaning to 'cordial')
'neither hot nor cold' is the second definition.
(I've seen this before)
(Other definitions for warm that I've seen before include "not cool?" , "Slightly hot" , "easily aroused" , "(Of a scent) fresh" , "Heated; enthusiastic" .)