A few to get today. Can I have a bit of help please
4a Just the thing for disturbing a nap! (6) -e-s-l
6d No unusual charge for a flag (8,5) standard ----e (grade)
16d Stick used for beating (5) no letters
17d Noted book used in the services (6) -----l
19a A prize that shows degeneration (7) --r-g--
21a Slight upset in temperment (13) i-d-s---i-a--