Warm and cold air mixed (7)
I believe the answer is:
cordial
'warm' is the definition.
(similar in meaning)
'cold air mixed' is the wordplay.
'mixed' indicates anagramming the letters.
'cold'+'air'='coldair'
'coldair' with letters rearranged gives 'CORDIAL'.
'and' is the link.
(Other definitions for cordial that I've seen before include "Pleasant - soft drink" , "7 [HEARTY]" , "stimulating drink" , "Hearty - drink" , "Warmly welcoming to the drink" .)