Small dress size (6)
I believe the answer is:
petite
'small dress size' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for petite that I've seen before include "Elfin" , "Little French" , "Tie pet up, being small and dainty" , "Attractively small" , "Small and dainty from France" .)