Saucy, pert (5)
I believe the answer is:
sassy
I believe this is a double definition.
'saucy' is the first definition.
(I know that saucy can be written as sassy)
'pert' is the second definition.
(I've seen this in another clue)
(Other definitions for sassy that I've seen before include "Cheeky American" , "(In US) saucy" , "Cheeky (US colloq.)" , "Impertinent (US colloq.)" , "Pert" .)