Time for an update on the last 10 clues:
21. how a Roman sentry may begin to question a lurker underscores the heart of its translation by Shakespeare
= Q_Goest (partial by Chi Meson)
[Q begins quo vadis and 'underscores' is for the "_" that follows the Q; the heart of the translation still needs work]
22. carelessly cram a man, for a Sec. - unsolved
23. bottoms of Nimes must count - unsolved
24. [tex]ji\sqrt{2\pi} \delta^{(1)} (k)[/tex] - unsolved (hint: I believe the factor of [itex]\sqrt{2\pi}[/itex] is there purely from a particular choice of convention)
25. the Stooge of the Commandments leads the Greek sharpdull = Moe Darklight (partial by turbo, george with the finish)
[Moe Howard, born Moses Horwitz, was one of the Three Stooges;
Darklight is something of an oxymoron, and the word 'oxymoron' is itself something of an oxymoron, being derived from the Greek words for sharp (oxy) and dull (moros). ]
26. Not derived from terrible X gradalis? = integral (solved by rewebster)
[1. not derived -> integrated
2. X = ten, gradalis = grail (Latin), ten+grail (jumble) -> integral]
27. Two-faced gatekeeper is mostly an @$$#0!3 = Janus (rewebster, shortly followed by turbo)
[1. Janus = Roman God with a double-sided head, guardian of gates and doors
2. Janus is mostly anus]
28. Fly trades one for a different fly's killing machine. = Zapper (rewebster)
[1. fly = zipper, "trades one for a" -> remove I, add A, zipper - i + a = zapper
2. "different fly" refers to the bug, bug "killing machine" -> bug zapper]
29. Old Indian teacher of natural laws has seen Gore jog clumsily! = George Jones (partial by rewebster)
[1. unsolved - see hint in post #80
2. seen gore jog = george jones (anagram)]
30. Mr. anser, in trouble. = Danger (partial by Chi Meson)
[1. unsolved
2. in trouble -> danger]