Weather set to change, darling (10)
I believe the answer is:
sweetheart
'darling' is the definition.
(I've seen this in another clue)
'weather set to change' is the wordplay.
'to change' indicates anagramming the letters.
'weather'+'set'='weatherset'
'weatherset' with letters rearranged gives 'SWEETHEART'.
(Other definitions for sweetheart that I've seen before include "Love" , "Darling" , "One loved" , "baby" , "flame?" .)