Small and pretty, daughter isn't ugly ultimately (6)
I believe the answer is:
dainty
'small and pretty' is the definition.
(I've seen this before)
'daughter isn't ugly ultimately' is the wordplay.
'daughter' becomes 'd'.
'isn't' becomes 'aint' (I've seen this before).
'ultimately' indicates one should take the final letters.
The last letter of 'ugly' is 'y'.
'd'+'aint'+'y'='DAINTY'
(Other definitions for dainty that I've seen before include "Small and pretty, delicate" , "Choice" , "Petite and elegant" , "Fragile" , "Delicate, neat" .)