TASK DEFINITION: You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.
PROBLEM: Category: LESSER-KNOWN PROVERBS 
Clue: It specifically "tries truth" as well as generally "tries all things"

SOLUTION: time

PROBLEM: Category: "R"RRRRR! 
Clue: Frank Gorshin played him on the small screen, Jim Carrey on the big

SOLUTION: the riddler

PROBLEM: Category: LOW TECH 
Clue: A tactical formation in the form of a V, or an "issue" dividing an otherwise unified group

SOLUTION:
a wedge