Clue answers:

After all, tomorrow is another day
antidisestablishmentarianism
Because it's there 
designated hitter
Invasion of the Body Snatchers
Let slip the dogs of war
Raiders of the Lost Ark
Roget's Thesaurus
Tess of the D'urbervilles
The House at Pooh Corner
The Man Who Mistook His Wife for a Hat
The buck stops here
The Fellowship of the Ring
The Times They Are A-Changin'
The Walrus and the Carpenter
Whistler's Mother

In the blanks, they look like this

D     raiDers of the lost ark
I     antIdisestablishmentarianism
S      teSs of the d'urbervilles
G      roGet's thesaurus
U   the bUck stops here
I     desIgnated hitter
S    invaSion of the body snatchers
E   the fEllowship of the ring
T    whisTler's mother
H    the House at pooh corner
E  becausE it's there 
L  the waLrus and the carpenter
I   the tImes they are a-changin'
M    the Man who mistook his wife for a hat
I  let slIp the dogs of war
T      afTer all, tomorrow is another day

The answer is:

DISGUISE THE LIMIT

Happy Purim!