Six unclued entries (three of three words, and one of two words) can be combined to make a quotation (in ODQ), and the remainder combine to reveal its author.

Across

11 Fashionable mission deemed impossible ultimately (7)
13 Far-reaching lake beside farmhouse (9, hyphened)
14 Unhealthy-looking meat snack (5)
21 Keen to get drunk in bender (4)
23 Sailor avoiding company seafood (7)
24 Granny turning over half of Indian bread? (4)
25 Dullness — there’s nothing quick about it (7)
30 Told US schoolgirl about ground nut (7)
31 Cleaner shot in the arm? (4)
32 Fizzy beer criticised, litre being wasted (7)
34 Holly Willoughby’s second law (4)
35 Gentleman...