Mild, as weather (5)
I believe the answer is:
balmy
'mild as weather' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for balmy that I've seen before include "(Of weather) pleasantly warm" , "Warm, summery" , "Of weather, mild and clement" , "Pleasantly mild" , "Mild and pleasant" .)