Sweet daughter is not with Yankee (6)
I believe the answer is:
dainty
'sweet' is the definition.
(thesaurus)
'daughter is not with yankee' is the wordplay.
'daughter' becomes 'd'.
'is not' becomes 'aint' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'yankee' becomes 'y' (phonetic alphabet: alpha, bravo, charlie etc.).
'd'+'aint'+'y'='DAINTY'
(Other definitions for dainty that I've seen before include "Petite and elegant" , "Titbit, delicacy" , "Exquisite" , "sensitive" , "Delicate and petite" .)