Presumptuous youngster (14)
I believe the answer is:
whippersnapper
(Other definitions for whippersnapper that I've seen before include "Scallywag" , "Impudent lad" , "Jumped-up youngster" , "Cheeky kid" , "cheeky upstart" .)
I believe the answer is:
whippersnapper
(Other definitions for whippersnapper that I've seen before include "Scallywag" , "Impudent lad" , "Jumped-up youngster" , "Cheeky kid" , "cheeky upstart" .)