Brain is mush today. Help please with 13 across Dry joke initially in exclusive story left by popular composer (5,6) 21 across Protective curtain, very large, left in artist's possession (8,3) and 24 across Note less than clean (7) and if it's not asking too much 18 down New deal excluding filling in actual roll (7). Dont remember the last time I couldn't finish so many. Thanks anyone