10a one dipping into US writer,inferior author 9- -e-a- - - - 9d cow just getting stuck in swampy ground 8 - - - - -t- - 20a writers appearing in short tv sequence, name of a poet 10 p
If you could leave aline between clues (and use spacings and ???? instead of ---, it would be easier for us to help.
Can you give the pattern for 20a please?