Saucy during supper time (4)
I believe the answer is:
pert
'saucy' is the definition.
(I know that saucy can be written as pert)
'during supper time' is the wordplay.
'during' says the answer is hidden in the clue.
'PERT' is hidden within 'supper time'.
(Other definitions for pert that I've seen before include "Jaunty" , "Saucy, lively" , "Forward - saucy" , "It's fresh" , "Cheeky, saucy" .)