11/22, 36/1D, 48/2, 9/30 and 17/46 combine to form anagrams of the titles of five works (four of two words, one of three) by a writer whose name will appear diagonally in the grid and must be shaded.
 

Across

 
1    Moll producing sauce or gravy (5)
6    Jolly sister shampooing (7)
12    Small box of rolled gold (4)
14    Mythical beast in the old tree (4)
15    Wild time in Sunshine State (5)
18    One yearning aloud for past master (4)
19    College cat quivering like a jellyfish? (7)
20    Blushing for clumsy journalist (7)
21    Aristo not on tribunal (3)
23    Fat Greek leading the life of Riley (6)
25    Ancient...