1. The answers to the clues below will have something in common.

A multitude of problems
Mythological waterway of Hades
Literary device

2. What do the following words have in common?

BAD
WICKED
KILLER
INSANE
RADICAL

Answers:

1)
Multitude of problems - Sea of trouble
Mythological waterway - River of forgetfulness
Literary device - Stream of consciousness

2. They are all slang words for GOOD. 

Credit: #2
NY Times Crossword - Jan. 7, 2014
Mark Bickham